1 // output.h -- manage the output file for gold -*- C++ -*-
3 // Copyright 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@google.com>.
6 // This file is part of gold.
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 3 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 // MA 02110-1301, USA.
32 #include "reloc-types.h"
37 class General_options
;
41 class Output_merge_base
;
43 class Relocatable_relocs
;
45 template<int size
, bool big_endian
>
47 template<int size
, bool big_endian
>
49 template<int size
, bool big_endian
>
50 class Sized_relobj_file
;
52 // An abtract class for data which has to go into the output file.
57 explicit Output_data()
58 : address_(0), data_size_(0), offset_(-1),
59 is_address_valid_(false), is_data_size_valid_(false),
60 is_offset_valid_(false), is_data_size_fixed_(false),
61 has_dynamic_reloc_(false)
67 // Return the address. For allocated sections, this is only valid
68 // after Layout::finalize is finished.
72 gold_assert(this->is_address_valid_
);
73 return this->address_
;
76 // Return the size of the data. For allocated sections, this must
77 // be valid after Layout::finalize calls set_address, but need not
78 // be valid before then.
82 gold_assert(this->is_data_size_valid_
);
83 return this->data_size_
;
86 // Get the current data size.
88 current_data_size() const
89 { return this->current_data_size_for_child(); }
91 // Return true if data size is fixed.
93 is_data_size_fixed() const
94 { return this->is_data_size_fixed_
; }
96 // Return the file offset. This is only valid after
97 // Layout::finalize is finished. For some non-allocated sections,
98 // it may not be valid until near the end of the link.
102 gold_assert(this->is_offset_valid_
);
103 return this->offset_
;
106 // Reset the address and file offset. This essentially disables the
107 // sanity testing about duplicate and unknown settings.
109 reset_address_and_file_offset()
111 this->is_address_valid_
= false;
112 this->is_offset_valid_
= false;
113 if (!this->is_data_size_fixed_
)
114 this->is_data_size_valid_
= false;
115 this->do_reset_address_and_file_offset();
118 // Return true if address and file offset already have reset values. In
119 // other words, calling reset_address_and_file_offset will not change them.
121 address_and_file_offset_have_reset_values() const
122 { return this->do_address_and_file_offset_have_reset_values(); }
124 // Return the required alignment.
127 { return this->do_addralign(); }
129 // Return whether this has a load address.
131 has_load_address() const
132 { return this->do_has_load_address(); }
134 // Return the load address.
137 { return this->do_load_address(); }
139 // Return whether this is an Output_section.
142 { return this->do_is_section(); }
144 // Return whether this is an Output_section of the specified type.
146 is_section_type(elfcpp::Elf_Word stt
) const
147 { return this->do_is_section_type(stt
); }
149 // Return whether this is an Output_section with the specified flag
152 is_section_flag_set(elfcpp::Elf_Xword shf
) const
153 { return this->do_is_section_flag_set(shf
); }
155 // Return the output section that this goes in, if there is one.
158 { return this->do_output_section(); }
160 const Output_section
*
161 output_section() const
162 { return this->do_output_section(); }
164 // Return the output section index, if there is an output section.
167 { return this->do_out_shndx(); }
169 // Set the output section index, if this is an output section.
171 set_out_shndx(unsigned int shndx
)
172 { this->do_set_out_shndx(shndx
); }
174 // Set the address and file offset of this data, and finalize the
175 // size of the data. This is called during Layout::finalize for
176 // allocated sections.
178 set_address_and_file_offset(uint64_t addr
, off_t off
)
180 this->set_address(addr
);
181 this->set_file_offset(off
);
182 this->finalize_data_size();
187 set_address(uint64_t addr
)
189 gold_assert(!this->is_address_valid_
);
190 this->address_
= addr
;
191 this->is_address_valid_
= true;
194 // Set the file offset.
196 set_file_offset(off_t off
)
198 gold_assert(!this->is_offset_valid_
);
200 this->is_offset_valid_
= true;
203 // Update the data size without finalizing it.
205 pre_finalize_data_size()
207 if (!this->is_data_size_valid_
)
209 // Tell the child class to update the data size.
210 this->update_data_size();
214 // Finalize the data size.
218 if (!this->is_data_size_valid_
)
220 // Tell the child class to set the data size.
221 this->set_final_data_size();
222 gold_assert(this->is_data_size_valid_
);
226 // Set the TLS offset. Called only for SHT_TLS sections.
228 set_tls_offset(uint64_t tls_base
)
229 { this->do_set_tls_offset(tls_base
); }
231 // Return the TLS offset, relative to the base of the TLS segment.
232 // Valid only for SHT_TLS sections.
235 { return this->do_tls_offset(); }
237 // Write the data to the output file. This is called after
238 // Layout::finalize is complete.
240 write(Output_file
* file
)
241 { this->do_write(file
); }
243 // This is called by Layout::finalize to note that the sizes of
244 // allocated sections must now be fixed.
247 { Output_data::allocated_sizes_are_fixed
= true; }
249 // Used to check that layout has been done.
252 { return Output_data::allocated_sizes_are_fixed
; }
254 // Note that a dynamic reloc has been applied to this data.
257 { this->has_dynamic_reloc_
= true; }
259 // Return whether a dynamic reloc has been applied.
261 has_dynamic_reloc() const
262 { return this->has_dynamic_reloc_
; }
264 // Whether the address is valid.
266 is_address_valid() const
267 { return this->is_address_valid_
; }
269 // Whether the file offset is valid.
271 is_offset_valid() const
272 { return this->is_offset_valid_
; }
274 // Whether the data size is valid.
276 is_data_size_valid() const
277 { return this->is_data_size_valid_
; }
279 // Print information to the map file.
281 print_to_mapfile(Mapfile
* mapfile
) const
282 { return this->do_print_to_mapfile(mapfile
); }
285 // Functions that child classes may or in some cases must implement.
287 // Write the data to the output file.
289 do_write(Output_file
*) = 0;
291 // Return the required alignment.
293 do_addralign() const = 0;
295 // Return whether this has a load address.
297 do_has_load_address() const
300 // Return the load address.
302 do_load_address() const
303 { gold_unreachable(); }
305 // Return whether this is an Output_section.
307 do_is_section() const
310 // Return whether this is an Output_section of the specified type.
311 // This only needs to be implement by Output_section.
313 do_is_section_type(elfcpp::Elf_Word
) const
316 // Return whether this is an Output_section with the specific flag
317 // set. This only needs to be implemented by Output_section.
319 do_is_section_flag_set(elfcpp::Elf_Xword
) const
322 // Return the output section, if there is one.
323 virtual Output_section
*
327 virtual const Output_section
*
328 do_output_section() const
331 // Return the output section index, if there is an output section.
334 { gold_unreachable(); }
336 // Set the output section index, if this is an output section.
338 do_set_out_shndx(unsigned int)
339 { gold_unreachable(); }
341 // This is a hook for derived classes to set the preliminary data size.
342 // This is called by pre_finalize_data_size, normally called during
343 // Layout::finalize, before the section address is set, and is used
344 // during an incremental update, when we need to know the size of a
345 // section before allocating space in the output file. For classes
346 // where the current data size is up to date, this default version of
347 // the method can be inherited.
352 // This is a hook for derived classes to set the data size. This is
353 // called by finalize_data_size, normally called during
354 // Layout::finalize, when the section address is set.
356 set_final_data_size()
357 { gold_unreachable(); }
359 // A hook for resetting the address and file offset.
361 do_reset_address_and_file_offset()
364 // Return true if address and file offset already have reset values. In
365 // other words, calling reset_address_and_file_offset will not change them.
366 // A child class overriding do_reset_address_and_file_offset may need to
367 // also override this.
369 do_address_and_file_offset_have_reset_values() const
370 { return !this->is_address_valid_
&& !this->is_offset_valid_
; }
372 // Set the TLS offset. Called only for SHT_TLS sections.
374 do_set_tls_offset(uint64_t)
375 { gold_unreachable(); }
377 // Return the TLS offset, relative to the base of the TLS segment.
378 // Valid only for SHT_TLS sections.
380 do_tls_offset() const
381 { gold_unreachable(); }
383 // Print to the map file. This only needs to be implemented by
384 // classes which may appear in a PT_LOAD segment.
386 do_print_to_mapfile(Mapfile
*) const
387 { gold_unreachable(); }
389 // Functions that child classes may call.
391 // Reset the address. The Output_section class needs this when an
392 // SHF_ALLOC input section is added to an output section which was
393 // formerly not SHF_ALLOC.
395 mark_address_invalid()
396 { this->is_address_valid_
= false; }
398 // Set the size of the data.
400 set_data_size(off_t data_size
)
402 gold_assert(!this->is_data_size_valid_
403 && !this->is_data_size_fixed_
);
404 this->data_size_
= data_size
;
405 this->is_data_size_valid_
= true;
408 // Fix the data size. Once it is fixed, it cannot be changed
409 // and the data size remains always valid.
413 gold_assert(this->is_data_size_valid_
);
414 this->is_data_size_fixed_
= true;
417 // Get the current data size--this is for the convenience of
418 // sections which build up their size over time.
420 current_data_size_for_child() const
421 { return this->data_size_
; }
423 // Set the current data size--this is for the convenience of
424 // sections which build up their size over time.
426 set_current_data_size_for_child(off_t data_size
)
428 gold_assert(!this->is_data_size_valid_
);
429 this->data_size_
= data_size
;
432 // Return default alignment for the target size.
436 // Return default alignment for a specified size--32 or 64.
438 default_alignment_for_size(int size
);
441 Output_data(const Output_data
&);
442 Output_data
& operator=(const Output_data
&);
444 // This is used for verification, to make sure that we don't try to
445 // change any sizes of allocated sections after we set the section
447 static bool allocated_sizes_are_fixed
;
449 // Memory address in output file.
451 // Size of data in output file.
453 // File offset of contents in output file.
455 // Whether address_ is valid.
456 bool is_address_valid_
: 1;
457 // Whether data_size_ is valid.
458 bool is_data_size_valid_
: 1;
459 // Whether offset_ is valid.
460 bool is_offset_valid_
: 1;
461 // Whether data size is fixed.
462 bool is_data_size_fixed_
: 1;
463 // Whether any dynamic relocs have been applied to this section.
464 bool has_dynamic_reloc_
: 1;
467 // Output the section headers.
469 class Output_section_headers
: public Output_data
472 Output_section_headers(const Layout
*,
473 const Layout::Segment_list
*,
474 const Layout::Section_list
*,
475 const Layout::Section_list
*,
477 const Output_section
*);
480 // Write the data to the file.
482 do_write(Output_file
*);
484 // Return the required alignment.
487 { return Output_data::default_alignment(); }
489 // Write to a map file.
491 do_print_to_mapfile(Mapfile
* mapfile
) const
492 { mapfile
->print_output_data(this, _("** section headers")); }
494 // Update the data size.
497 { this->set_data_size(this->do_size()); }
499 // Set final data size.
501 set_final_data_size()
502 { this->set_data_size(this->do_size()); }
505 // Write the data to the file with the right size and endianness.
506 template<int size
, bool big_endian
>
508 do_sized_write(Output_file
*);
510 // Compute data size.
514 const Layout
* layout_
;
515 const Layout::Segment_list
* segment_list_
;
516 const Layout::Section_list
* section_list_
;
517 const Layout::Section_list
* unattached_section_list_
;
518 const Stringpool
* secnamepool_
;
519 const Output_section
* shstrtab_section_
;
522 // Output the segment headers.
524 class Output_segment_headers
: public Output_data
527 Output_segment_headers(const Layout::Segment_list
& segment_list
);
530 // Write the data to the file.
532 do_write(Output_file
*);
534 // Return the required alignment.
537 { return Output_data::default_alignment(); }
539 // Write to a map file.
541 do_print_to_mapfile(Mapfile
* mapfile
) const
542 { mapfile
->print_output_data(this, _("** segment headers")); }
544 // Set final data size.
546 set_final_data_size()
547 { this->set_data_size(this->do_size()); }
550 // Write the data to the file with the right size and endianness.
551 template<int size
, bool big_endian
>
553 do_sized_write(Output_file
*);
555 // Compute the current size.
559 const Layout::Segment_list
& segment_list_
;
562 // Output the ELF file header.
564 class Output_file_header
: public Output_data
567 Output_file_header(const Target
*,
569 const Output_segment_headers
*,
572 // Add information about the section headers. We lay out the ELF
573 // file header before we create the section headers.
574 void set_section_info(const Output_section_headers
*,
575 const Output_section
* shstrtab
);
578 // Write the data to the file.
580 do_write(Output_file
*);
582 // Return the required alignment.
585 { return Output_data::default_alignment(); }
587 // Write to a map file.
589 do_print_to_mapfile(Mapfile
* mapfile
) const
590 { mapfile
->print_output_data(this, _("** file header")); }
592 // Set final data size.
594 set_final_data_size(void)
595 { this->set_data_size(this->do_size()); }
598 // Write the data to the file with the right size and endianness.
599 template<int size
, bool big_endian
>
601 do_sized_write(Output_file
*);
603 // Return the value to use for the entry address.
605 typename
elfcpp::Elf_types
<size
>::Elf_Addr
608 // Compute the current data size.
612 const Target
* target_
;
613 const Symbol_table
* symtab_
;
614 const Output_segment_headers
* segment_header_
;
615 const Output_section_headers
* section_header_
;
616 const Output_section
* shstrtab_
;
620 // Output sections are mainly comprised of input sections. However,
621 // there are cases where we have data to write out which is not in an
622 // input section. Output_section_data is used in such cases. This is
623 // an abstract base class.
625 class Output_section_data
: public Output_data
628 Output_section_data(off_t data_size
, uint64_t addralign
,
629 bool is_data_size_fixed
)
630 : Output_data(), output_section_(NULL
), addralign_(addralign
)
632 this->set_data_size(data_size
);
633 if (is_data_size_fixed
)
634 this->fix_data_size();
637 Output_section_data(uint64_t addralign
)
638 : Output_data(), output_section_(NULL
), addralign_(addralign
)
641 // Return the output section.
644 { return this->output_section_
; }
646 const Output_section
*
647 output_section() const
648 { return this->output_section_
; }
650 // Record the output section.
652 set_output_section(Output_section
* os
);
654 // Add an input section, for SHF_MERGE sections. This returns true
655 // if the section was handled.
657 add_input_section(Relobj
* object
, unsigned int shndx
)
658 { return this->do_add_input_section(object
, shndx
); }
660 // Given an input OBJECT, an input section index SHNDX within that
661 // object, and an OFFSET relative to the start of that input
662 // section, return whether or not the corresponding offset within
663 // the output section is known. If this function returns true, it
664 // sets *POUTPUT to the output offset. The value -1 indicates that
665 // this input offset is being discarded.
667 output_offset(const Relobj
* object
, unsigned int shndx
,
668 section_offset_type offset
,
669 section_offset_type
* poutput
) const
670 { return this->do_output_offset(object
, shndx
, offset
, poutput
); }
672 // Return whether this is the merge section for the input section
673 // SHNDX in OBJECT. This should return true when output_offset
674 // would return true for some values of OFFSET.
676 is_merge_section_for(const Relobj
* object
, unsigned int shndx
) const
677 { return this->do_is_merge_section_for(object
, shndx
); }
679 // Write the contents to a buffer. This is used for sections which
680 // require postprocessing, such as compression.
682 write_to_buffer(unsigned char* buffer
)
683 { this->do_write_to_buffer(buffer
); }
685 // Print merge stats to stderr. This should only be called for
686 // SHF_MERGE sections.
688 print_merge_stats(const char* section_name
)
689 { this->do_print_merge_stats(section_name
); }
692 // The child class must implement do_write.
694 // The child class may implement specific adjustments to the output
697 do_adjust_output_section(Output_section
*)
700 // May be implemented by child class. Return true if the section
703 do_add_input_section(Relobj
*, unsigned int)
704 { gold_unreachable(); }
706 // The child class may implement output_offset.
708 do_output_offset(const Relobj
*, unsigned int, section_offset_type
,
709 section_offset_type
*) const
712 // The child class may implement is_merge_section_for.
714 do_is_merge_section_for(const Relobj
*, unsigned int) const
717 // The child class may implement write_to_buffer. Most child
718 // classes can not appear in a compressed section, and they do not
721 do_write_to_buffer(unsigned char*)
722 { gold_unreachable(); }
724 // Print merge statistics.
726 do_print_merge_stats(const char*)
727 { gold_unreachable(); }
729 // Return the required alignment.
732 { return this->addralign_
; }
734 // Return the output section.
737 { return this->output_section_
; }
739 const Output_section
*
740 do_output_section() const
741 { return this->output_section_
; }
743 // Return the section index of the output section.
745 do_out_shndx() const;
747 // Set the alignment.
749 set_addralign(uint64_t addralign
);
752 // The output section for this section.
753 Output_section
* output_section_
;
754 // The required alignment.
758 // Some Output_section_data classes build up their data step by step,
759 // rather than all at once. This class provides an interface for
762 class Output_section_data_build
: public Output_section_data
765 Output_section_data_build(uint64_t addralign
)
766 : Output_section_data(addralign
)
769 Output_section_data_build(off_t data_size
, uint64_t addralign
)
770 : Output_section_data(data_size
, addralign
, false)
773 // Set the current data size.
775 set_current_data_size(off_t data_size
)
776 { this->set_current_data_size_for_child(data_size
); }
779 // Set the final data size.
781 set_final_data_size()
782 { this->set_data_size(this->current_data_size_for_child()); }
785 // A simple case of Output_data in which we have constant data to
788 class Output_data_const
: public Output_section_data
791 Output_data_const(const std::string
& data
, uint64_t addralign
)
792 : Output_section_data(data
.size(), addralign
, true), data_(data
)
795 Output_data_const(const char* p
, off_t len
, uint64_t addralign
)
796 : Output_section_data(len
, addralign
, true), data_(p
, len
)
799 Output_data_const(const unsigned char* p
, off_t len
, uint64_t addralign
)
800 : Output_section_data(len
, addralign
, true),
801 data_(reinterpret_cast<const char*>(p
), len
)
805 // Write the data to the output file.
807 do_write(Output_file
*);
809 // Write the data to a buffer.
811 do_write_to_buffer(unsigned char* buffer
)
812 { memcpy(buffer
, this->data_
.data(), this->data_
.size()); }
814 // Write to a map file.
816 do_print_to_mapfile(Mapfile
* mapfile
) const
817 { mapfile
->print_output_data(this, _("** fill")); }
823 // Another version of Output_data with constant data, in which the
824 // buffer is allocated by the caller.
826 class Output_data_const_buffer
: public Output_section_data
829 Output_data_const_buffer(const unsigned char* p
, off_t len
,
830 uint64_t addralign
, const char* map_name
)
831 : Output_section_data(len
, addralign
, true),
832 p_(p
), map_name_(map_name
)
836 // Write the data the output file.
838 do_write(Output_file
*);
840 // Write the data to a buffer.
842 do_write_to_buffer(unsigned char* buffer
)
843 { memcpy(buffer
, this->p_
, this->data_size()); }
845 // Write to a map file.
847 do_print_to_mapfile(Mapfile
* mapfile
) const
848 { mapfile
->print_output_data(this, _(this->map_name_
)); }
851 // The data to output.
852 const unsigned char* p_
;
853 // Name to use in a map file. Maps are a rarely used feature, but
854 // the space usage is minor as aren't very many of these objects.
855 const char* map_name_
;
858 // A place holder for a fixed amount of data written out via some
861 class Output_data_fixed_space
: public Output_section_data
864 Output_data_fixed_space(off_t data_size
, uint64_t addralign
,
865 const char* map_name
)
866 : Output_section_data(data_size
, addralign
, true),
871 // Write out the data--the actual data must be written out
874 do_write(Output_file
*)
877 // Write to a map file.
879 do_print_to_mapfile(Mapfile
* mapfile
) const
880 { mapfile
->print_output_data(this, _(this->map_name_
)); }
883 // Name to use in a map file. Maps are a rarely used feature, but
884 // the space usage is minor as aren't very many of these objects.
885 const char* map_name_
;
888 // A place holder for variable sized data written out via some other
891 class Output_data_space
: public Output_section_data_build
894 explicit Output_data_space(uint64_t addralign
, const char* map_name
)
895 : Output_section_data_build(addralign
),
899 explicit Output_data_space(off_t data_size
, uint64_t addralign
,
900 const char* map_name
)
901 : Output_section_data_build(data_size
, addralign
),
905 // Set the alignment.
907 set_space_alignment(uint64_t align
)
908 { this->set_addralign(align
); }
911 // Write out the data--the actual data must be written out
914 do_write(Output_file
*)
917 // Write to a map file.
919 do_print_to_mapfile(Mapfile
* mapfile
) const
920 { mapfile
->print_output_data(this, _(this->map_name_
)); }
923 // Name to use in a map file. Maps are a rarely used feature, but
924 // the space usage is minor as aren't very many of these objects.
925 const char* map_name_
;
928 // Fill fixed space with zeroes. This is just like
929 // Output_data_fixed_space, except that the map name is known.
931 class Output_data_zero_fill
: public Output_section_data
934 Output_data_zero_fill(off_t data_size
, uint64_t addralign
)
935 : Output_section_data(data_size
, addralign
, true)
939 // There is no data to write out.
941 do_write(Output_file
*)
944 // Write to a map file.
946 do_print_to_mapfile(Mapfile
* mapfile
) const
947 { mapfile
->print_output_data(this, "** zero fill"); }
950 // A string table which goes into an output section.
952 class Output_data_strtab
: public Output_section_data
955 Output_data_strtab(Stringpool
* strtab
)
956 : Output_section_data(1), strtab_(strtab
)
960 // This is called to update the section size prior to assigning
961 // the address and file offset.
964 { this->set_final_data_size(); }
966 // This is called to set the address and file offset. Here we make
967 // sure that the Stringpool is finalized.
969 set_final_data_size();
971 // Write out the data.
973 do_write(Output_file
*);
975 // Write the data to a buffer.
977 do_write_to_buffer(unsigned char* buffer
)
978 { this->strtab_
->write_to_buffer(buffer
, this->data_size()); }
980 // Write to a map file.
982 do_print_to_mapfile(Mapfile
* mapfile
) const
983 { mapfile
->print_output_data(this, _("** string table")); }
989 // This POD class is used to represent a single reloc in the output
990 // file. This could be a private class within Output_data_reloc, but
991 // the templatization is complex enough that I broke it out into a
992 // separate class. The class is templatized on either elfcpp::SHT_REL
993 // or elfcpp::SHT_RELA, and also on whether this is a dynamic
994 // relocation or an ordinary relocation.
996 // A relocation can be against a global symbol, a local symbol, a
997 // local section symbol, an output section, or the undefined symbol at
998 // index 0. We represent the latter by using a NULL global symbol.
1000 template<int sh_type
, bool dynamic
, int size
, bool big_endian
>
1003 template<bool dynamic
, int size
, bool big_endian
>
1004 class Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>
1007 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
1008 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Addend
;
1010 static const Address invalid_address
= static_cast<Address
>(0) - 1;
1012 // An uninitialized entry. We need this because we want to put
1013 // instances of this class into an STL container.
1015 : local_sym_index_(INVALID_CODE
)
1018 // We have a bunch of different constructors. They come in pairs
1019 // depending on how the address of the relocation is specified. It
1020 // can either be an offset in an Output_data or an offset in an
1023 // A reloc against a global symbol.
1025 Output_reloc(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1026 Address address
, bool is_relative
, bool is_symbolless
);
1028 Output_reloc(Symbol
* gsym
, unsigned int type
,
1029 Sized_relobj
<size
, big_endian
>* relobj
,
1030 unsigned int shndx
, Address address
, bool is_relative
,
1031 bool is_symbolless
);
1033 // A reloc against a local symbol or local section symbol.
1035 Output_reloc(Sized_relobj
<size
, big_endian
>* relobj
,
1036 unsigned int local_sym_index
, unsigned int type
,
1037 Output_data
* od
, Address address
, bool is_relative
,
1038 bool is_symbolless
, bool is_section_symbol
);
1040 Output_reloc(Sized_relobj
<size
, big_endian
>* relobj
,
1041 unsigned int local_sym_index
, unsigned int type
,
1042 unsigned int shndx
, Address address
, bool is_relative
,
1043 bool is_symbolless
, bool is_section_symbol
);
1045 // A reloc against the STT_SECTION symbol of an output section.
1047 Output_reloc(Output_section
* os
, unsigned int type
, Output_data
* od
,
1050 Output_reloc(Output_section
* os
, unsigned int type
,
1051 Sized_relobj
<size
, big_endian
>* relobj
,
1052 unsigned int shndx
, Address address
);
1054 // An absolute relocation with no symbol.
1056 Output_reloc(unsigned int type
, Output_data
* od
, Address address
);
1058 Output_reloc(unsigned int type
, Sized_relobj
<size
, big_endian
>* relobj
,
1059 unsigned int shndx
, Address address
);
1061 // A target specific relocation. The target will be called to get
1062 // the symbol index, passing ARG. The type and offset will be set
1063 // as for other relocation types.
1065 Output_reloc(unsigned int type
, void* arg
, Output_data
* od
,
1068 Output_reloc(unsigned int type
, void* arg
,
1069 Sized_relobj
<size
, big_endian
>* relobj
,
1070 unsigned int shndx
, Address address
);
1072 // Return the reloc type.
1075 { return this->type_
; }
1077 // Return whether this is a RELATIVE relocation.
1080 { return this->is_relative_
; }
1082 // Return whether this is a relocation which should not use
1083 // a symbol, but which obtains its addend from a symbol.
1085 is_symbolless() const
1086 { return this->is_symbolless_
; }
1088 // Return whether this is against a local section symbol.
1090 is_local_section_symbol() const
1092 return (this->local_sym_index_
!= GSYM_CODE
1093 && this->local_sym_index_
!= SECTION_CODE
1094 && this->local_sym_index_
!= INVALID_CODE
1095 && this->local_sym_index_
!= TARGET_CODE
1096 && this->is_section_symbol_
);
1099 // Return whether this is a target specific relocation.
1101 is_target_specific() const
1102 { return this->local_sym_index_
== TARGET_CODE
; }
1104 // Return the argument to pass to the target for a target specific
1109 gold_assert(this->local_sym_index_
== TARGET_CODE
);
1110 return this->u1_
.arg
;
1113 // For a local section symbol, return the offset of the input
1114 // section within the output section. ADDEND is the addend being
1115 // applied to the input section.
1117 local_section_offset(Addend addend
) const;
1119 // Get the value of the symbol referred to by a Rel relocation when
1120 // we are adding the given ADDEND.
1122 symbol_value(Addend addend
) const;
1124 // If this relocation is against an input section, return the
1125 // relocatable object containing the input section.
1126 Sized_relobj
<size
, big_endian
>*
1129 if (this->shndx_
== INVALID_CODE
)
1131 return this->u2_
.relobj
;
1134 // Write the reloc entry to an output view.
1136 write(unsigned char* pov
) const;
1138 // Write the offset and info fields to Write_rel.
1139 template<typename Write_rel
>
1140 void write_rel(Write_rel
*) const;
1142 // This is used when sorting dynamic relocs. Return -1 to sort this
1143 // reloc before R2, 0 to sort the same as R2, 1 to sort after R2.
1145 compare(const Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>& r2
)
1148 // Return whether this reloc should be sorted before the argument
1149 // when sorting dynamic relocs.
1151 sort_before(const Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>&
1153 { return this->compare(r2
) < 0; }
1156 // Record that we need a dynamic symbol index.
1158 set_needs_dynsym_index();
1160 // Return the symbol index.
1162 get_symbol_index() const;
1164 // Return the output address.
1166 get_address() const;
1168 // Codes for local_sym_index_.
1177 // Invalid uninitialized entry.
1183 // For a local symbol or local section symbol
1184 // (this->local_sym_index_ >= 0), the object. We will never
1185 // generate a relocation against a local symbol in a dynamic
1186 // object; that doesn't make sense. And our callers will always
1187 // be templatized, so we use Sized_relobj here.
1188 Sized_relobj
<size
, big_endian
>* relobj
;
1189 // For a global symbol (this->local_sym_index_ == GSYM_CODE, the
1190 // symbol. If this is NULL, it indicates a relocation against the
1191 // undefined 0 symbol.
1193 // For a relocation against an output section
1194 // (this->local_sym_index_ == SECTION_CODE), the output section.
1196 // For a target specific relocation, an argument to pass to the
1202 // If this->shndx_ is not INVALID CODE, the object which holds the
1203 // input section being used to specify the reloc address.
1204 Sized_relobj
<size
, big_endian
>* relobj
;
1205 // If this->shndx_ is INVALID_CODE, the output data being used to
1206 // specify the reloc address. This may be NULL if the reloc
1207 // address is absolute.
1210 // The address offset within the input section or the Output_data.
1212 // This is GSYM_CODE for a global symbol, or SECTION_CODE for a
1213 // relocation against an output section, or TARGET_CODE for a target
1214 // specific relocation, or INVALID_CODE for an uninitialized value.
1215 // Otherwise, for a local symbol (this->is_section_symbol_ is
1216 // false), the local symbol index. For a local section symbol
1217 // (this->is_section_symbol_ is true), the section index in the
1219 unsigned int local_sym_index_
;
1220 // The reloc type--a processor specific code.
1221 unsigned int type_
: 29;
1222 // True if the relocation is a RELATIVE relocation.
1223 bool is_relative_
: 1;
1224 // True if the relocation is one which should not use
1225 // a symbol, but which obtains its addend from a symbol.
1226 bool is_symbolless_
: 1;
1227 // True if the relocation is against a section symbol.
1228 bool is_section_symbol_
: 1;
1229 // If the reloc address is an input section in an object, the
1230 // section index. This is INVALID_CODE if the reloc address is
1231 // specified in some other way.
1232 unsigned int shndx_
;
1235 // The SHT_RELA version of Output_reloc<>. This is just derived from
1236 // the SHT_REL version of Output_reloc, but it adds an addend.
1238 template<bool dynamic
, int size
, bool big_endian
>
1239 class Output_reloc
<elfcpp::SHT_RELA
, dynamic
, size
, big_endian
>
1242 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
1243 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Addend
;
1245 // An uninitialized entry.
1250 // A reloc against a global symbol.
1252 Output_reloc(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1253 Address address
, Addend addend
, bool is_relative
,
1255 : rel_(gsym
, type
, od
, address
, is_relative
, is_symbolless
),
1259 Output_reloc(Symbol
* gsym
, unsigned int type
,
1260 Sized_relobj
<size
, big_endian
>* relobj
,
1261 unsigned int shndx
, Address address
, Addend addend
,
1262 bool is_relative
, bool is_symbolless
)
1263 : rel_(gsym
, type
, relobj
, shndx
, address
, is_relative
,
1264 is_symbolless
), addend_(addend
)
1267 // A reloc against a local symbol.
1269 Output_reloc(Sized_relobj
<size
, big_endian
>* relobj
,
1270 unsigned int local_sym_index
, unsigned int type
,
1271 Output_data
* od
, Address address
,
1272 Addend addend
, bool is_relative
,
1273 bool is_symbolless
, bool is_section_symbol
)
1274 : rel_(relobj
, local_sym_index
, type
, od
, address
, is_relative
,
1275 is_symbolless
, is_section_symbol
),
1279 Output_reloc(Sized_relobj
<size
, big_endian
>* relobj
,
1280 unsigned int local_sym_index
, unsigned int type
,
1281 unsigned int shndx
, Address address
,
1282 Addend addend
, bool is_relative
,
1283 bool is_symbolless
, bool is_section_symbol
)
1284 : rel_(relobj
, local_sym_index
, type
, shndx
, address
, is_relative
,
1285 is_symbolless
, is_section_symbol
),
1289 // A reloc against the STT_SECTION symbol of an output section.
1291 Output_reloc(Output_section
* os
, unsigned int type
, Output_data
* od
,
1292 Address address
, Addend addend
)
1293 : rel_(os
, type
, od
, address
), addend_(addend
)
1296 Output_reloc(Output_section
* os
, unsigned int type
,
1297 Sized_relobj
<size
, big_endian
>* relobj
,
1298 unsigned int shndx
, Address address
, Addend addend
)
1299 : rel_(os
, type
, relobj
, shndx
, address
), addend_(addend
)
1302 // An absolute relocation with no symbol.
1304 Output_reloc(unsigned int type
, Output_data
* od
, Address address
,
1306 : rel_(type
, od
, address
), addend_(addend
)
1309 Output_reloc(unsigned int type
, Sized_relobj
<size
, big_endian
>* relobj
,
1310 unsigned int shndx
, Address address
, Addend addend
)
1311 : rel_(type
, relobj
, shndx
, address
), addend_(addend
)
1314 // A target specific relocation. The target will be called to get
1315 // the symbol index and the addend, passing ARG. The type and
1316 // offset will be set as for other relocation types.
1318 Output_reloc(unsigned int type
, void* arg
, Output_data
* od
,
1319 Address address
, Addend addend
)
1320 : rel_(type
, arg
, od
, address
), addend_(addend
)
1323 Output_reloc(unsigned int type
, void* arg
,
1324 Sized_relobj
<size
, big_endian
>* relobj
,
1325 unsigned int shndx
, Address address
, Addend addend
)
1326 : rel_(type
, arg
, relobj
, shndx
, address
), addend_(addend
)
1329 // Return whether this is a RELATIVE relocation.
1332 { return this->rel_
.is_relative(); }
1334 // Return whether this is a relocation which should not use
1335 // a symbol, but which obtains its addend from a symbol.
1337 is_symbolless() const
1338 { return this->rel_
.is_symbolless(); }
1340 // If this relocation is against an input section, return the
1341 // relocatable object containing the input section.
1342 Sized_relobj
<size
, big_endian
>*
1344 { return this->rel_
.get_relobj(); }
1346 // Write the reloc entry to an output view.
1348 write(unsigned char* pov
) const;
1350 // Return whether this reloc should be sorted before the argument
1351 // when sorting dynamic relocs.
1353 sort_before(const Output_reloc
<elfcpp::SHT_RELA
, dynamic
, size
, big_endian
>&
1356 int i
= this->rel_
.compare(r2
.rel_
);
1362 return this->addend_
< r2
.addend_
;
1367 Output_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
> rel_
;
1372 // Output_data_reloc_generic is a non-template base class for
1373 // Output_data_reloc_base. This gives the generic code a way to hold
1374 // a pointer to a reloc section.
1376 class Output_data_reloc_generic
: public Output_section_data_build
1379 Output_data_reloc_generic(int size
, bool sort_relocs
)
1380 : Output_section_data_build(Output_data::default_alignment_for_size(size
)),
1381 relative_reloc_count_(0), sort_relocs_(sort_relocs
)
1384 // Return the number of relative relocs in this section.
1386 relative_reloc_count() const
1387 { return this->relative_reloc_count_
; }
1389 // Whether we should sort the relocs.
1392 { return this->sort_relocs_
; }
1395 // Note that we've added another relative reloc.
1397 bump_relative_reloc_count()
1398 { ++this->relative_reloc_count_
; }
1401 // The number of relative relocs added to this section. This is to
1402 // support DT_RELCOUNT.
1403 size_t relative_reloc_count_
;
1404 // Whether to sort the relocations when writing them out, to make
1405 // the dynamic linker more efficient.
1409 // Output_data_reloc is used to manage a section containing relocs.
1410 // SH_TYPE is either elfcpp::SHT_REL or elfcpp::SHT_RELA. DYNAMIC
1411 // indicates whether this is a dynamic relocation or a normal
1412 // relocation. Output_data_reloc_base is a base class.
1413 // Output_data_reloc is the real class, which we specialize based on
1416 template<int sh_type
, bool dynamic
, int size
, bool big_endian
>
1417 class Output_data_reloc_base
: public Output_data_reloc_generic
1420 typedef Output_reloc
<sh_type
, dynamic
, size
, big_endian
> Output_reloc_type
;
1421 typedef typename
Output_reloc_type::Address Address
;
1422 static const int reloc_size
=
1423 Reloc_types
<sh_type
, size
, big_endian
>::reloc_size
;
1425 // Construct the section.
1426 Output_data_reloc_base(bool sort_relocs
)
1427 : Output_data_reloc_generic(size
, sort_relocs
)
1431 // Write out the data.
1433 do_write(Output_file
*);
1435 // Set the entry size and the link.
1437 do_adjust_output_section(Output_section
* os
);
1439 // Write to a map file.
1441 do_print_to_mapfile(Mapfile
* mapfile
) const
1443 mapfile
->print_output_data(this,
1445 ? _("** dynamic relocs")
1449 // Add a relocation entry.
1451 add(Output_data
* od
, const Output_reloc_type
& reloc
)
1453 this->relocs_
.push_back(reloc
);
1454 this->set_current_data_size(this->relocs_
.size() * reloc_size
);
1455 od
->add_dynamic_reloc();
1456 if (reloc
.is_relative())
1457 this->bump_relative_reloc_count();
1458 Sized_relobj
<size
, big_endian
>* relobj
= reloc
.get_relobj();
1460 relobj
->add_dyn_reloc(this->relocs_
.size() - 1);
1464 typedef std::vector
<Output_reloc_type
> Relocs
;
1466 // The class used to sort the relocations.
1467 struct Sort_relocs_comparison
1470 operator()(const Output_reloc_type
& r1
, const Output_reloc_type
& r2
) const
1471 { return r1
.sort_before(r2
); }
1474 // The relocations in this section.
1478 // The class which callers actually create.
1480 template<int sh_type
, bool dynamic
, int size
, bool big_endian
>
1481 class Output_data_reloc
;
1483 // The SHT_REL version of Output_data_reloc.
1485 template<bool dynamic
, int size
, bool big_endian
>
1486 class Output_data_reloc
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>
1487 : public Output_data_reloc_base
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>
1490 typedef Output_data_reloc_base
<elfcpp::SHT_REL
, dynamic
, size
,
1494 typedef typename
Base::Output_reloc_type Output_reloc_type
;
1495 typedef typename
Output_reloc_type::Address Address
;
1497 Output_data_reloc(bool sr
)
1498 : Output_data_reloc_base
<elfcpp::SHT_REL
, dynamic
, size
, big_endian
>(sr
)
1501 // Add a reloc against a global symbol.
1504 add_global(Symbol
* gsym
, unsigned int type
, Output_data
* od
, Address address
)
1505 { this->add(od
, Output_reloc_type(gsym
, type
, od
, address
, false, false)); }
1508 add_global(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1509 Sized_relobj
<size
, big_endian
>* relobj
,
1510 unsigned int shndx
, Address address
)
1511 { this->add(od
, Output_reloc_type(gsym
, type
, relobj
, shndx
, address
,
1514 // These are to simplify the Copy_relocs class.
1517 add_global(Symbol
* gsym
, unsigned int type
, Output_data
* od
, Address address
,
1520 gold_assert(addend
== 0);
1521 this->add_global(gsym
, type
, od
, address
);
1525 add_global(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1526 Sized_relobj
<size
, big_endian
>* relobj
,
1527 unsigned int shndx
, Address address
, Address addend
)
1529 gold_assert(addend
== 0);
1530 this->add_global(gsym
, type
, od
, relobj
, shndx
, address
);
1533 // Add a RELATIVE reloc against a global symbol. The final relocation
1534 // will not reference the symbol.
1537 add_global_relative(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1539 { this->add(od
, Output_reloc_type(gsym
, type
, od
, address
, true, true)); }
1542 add_global_relative(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1543 Sized_relobj
<size
, big_endian
>* relobj
,
1544 unsigned int shndx
, Address address
)
1546 this->add(od
, Output_reloc_type(gsym
, type
, relobj
, shndx
, address
,
1550 // Add a global relocation which does not use a symbol for the relocation,
1551 // but which gets its addend from a symbol.
1554 add_symbolless_global_addend(Symbol
* gsym
, unsigned int type
,
1555 Output_data
* od
, Address address
)
1556 { this->add(od
, Output_reloc_type(gsym
, type
, od
, address
, false, true)); }
1559 add_symbolless_global_addend(Symbol
* gsym
, unsigned int type
,
1561 Sized_relobj
<size
, big_endian
>* relobj
,
1562 unsigned int shndx
, Address address
)
1564 this->add(od
, Output_reloc_type(gsym
, type
, relobj
, shndx
, address
,
1568 // Add a reloc against a local symbol.
1571 add_local(Sized_relobj
<size
, big_endian
>* relobj
,
1572 unsigned int local_sym_index
, unsigned int type
,
1573 Output_data
* od
, Address address
)
1575 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, od
,
1576 address
, false, false, false));
1580 add_local(Sized_relobj
<size
, big_endian
>* relobj
,
1581 unsigned int local_sym_index
, unsigned int type
,
1582 Output_data
* od
, unsigned int shndx
, Address address
)
1584 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, shndx
,
1585 address
, false, false, false));
1588 // Add a RELATIVE reloc against a local symbol.
1591 add_local_relative(Sized_relobj
<size
, big_endian
>* relobj
,
1592 unsigned int local_sym_index
, unsigned int type
,
1593 Output_data
* od
, Address address
)
1595 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, od
,
1596 address
, true, true, false));
1600 add_local_relative(Sized_relobj
<size
, big_endian
>* relobj
,
1601 unsigned int local_sym_index
, unsigned int type
,
1602 Output_data
* od
, unsigned int shndx
, Address address
)
1604 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, shndx
,
1605 address
, true, true, false));
1608 // Add a local relocation which does not use a symbol for the relocation,
1609 // but which gets its addend from a symbol.
1612 add_symbolless_local_addend(Sized_relobj
<size
, big_endian
>* relobj
,
1613 unsigned int local_sym_index
, unsigned int type
,
1614 Output_data
* od
, Address address
)
1616 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, od
,
1617 address
, false, true, false));
1621 add_symbolless_local_addend(Sized_relobj
<size
, big_endian
>* relobj
,
1622 unsigned int local_sym_index
, unsigned int type
,
1623 Output_data
* od
, unsigned int shndx
,
1626 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, shndx
,
1627 address
, false, true, false));
1630 // Add a reloc against a local section symbol. This will be
1631 // converted into a reloc against the STT_SECTION symbol of the
1635 add_local_section(Sized_relobj
<size
, big_endian
>* relobj
,
1636 unsigned int input_shndx
, unsigned int type
,
1637 Output_data
* od
, Address address
)
1639 this->add(od
, Output_reloc_type(relobj
, input_shndx
, type
, od
,
1640 address
, false, false, true));
1644 add_local_section(Sized_relobj
<size
, big_endian
>* relobj
,
1645 unsigned int input_shndx
, unsigned int type
,
1646 Output_data
* od
, unsigned int shndx
, Address address
)
1648 this->add(od
, Output_reloc_type(relobj
, input_shndx
, type
, shndx
,
1649 address
, false, false, true));
1652 // A reloc against the STT_SECTION symbol of an output section.
1653 // OS is the Output_section that the relocation refers to; OD is
1654 // the Output_data object being relocated.
1657 add_output_section(Output_section
* os
, unsigned int type
,
1658 Output_data
* od
, Address address
)
1659 { this->add(od
, Output_reloc_type(os
, type
, od
, address
)); }
1662 add_output_section(Output_section
* os
, unsigned int type
, Output_data
* od
,
1663 Sized_relobj
<size
, big_endian
>* relobj
,
1664 unsigned int shndx
, Address address
)
1665 { this->add(od
, Output_reloc_type(os
, type
, relobj
, shndx
, address
)); }
1667 // Add an absolute relocation.
1670 add_absolute(unsigned int type
, Output_data
* od
, Address address
)
1671 { this->add(od
, Output_reloc_type(type
, od
, address
)); }
1674 add_absolute(unsigned int type
, Output_data
* od
,
1675 Sized_relobj
<size
, big_endian
>* relobj
,
1676 unsigned int shndx
, Address address
)
1677 { this->add(od
, Output_reloc_type(type
, relobj
, shndx
, address
)); }
1679 // Add a target specific relocation. A target which calls this must
1680 // define the reloc_symbol_index and reloc_addend virtual functions.
1683 add_target_specific(unsigned int type
, void* arg
, Output_data
* od
,
1685 { this->add(od
, Output_reloc_type(type
, arg
, od
, address
)); }
1688 add_target_specific(unsigned int type
, void* arg
, Output_data
* od
,
1689 Sized_relobj
<size
, big_endian
>* relobj
,
1690 unsigned int shndx
, Address address
)
1691 { this->add(od
, Output_reloc_type(type
, arg
, relobj
, shndx
, address
)); }
1694 // The SHT_RELA version of Output_data_reloc.
1696 template<bool dynamic
, int size
, bool big_endian
>
1697 class Output_data_reloc
<elfcpp::SHT_RELA
, dynamic
, size
, big_endian
>
1698 : public Output_data_reloc_base
<elfcpp::SHT_RELA
, dynamic
, size
, big_endian
>
1701 typedef Output_data_reloc_base
<elfcpp::SHT_RELA
, dynamic
, size
,
1705 typedef typename
Base::Output_reloc_type Output_reloc_type
;
1706 typedef typename
Output_reloc_type::Address Address
;
1707 typedef typename
Output_reloc_type::Addend Addend
;
1709 Output_data_reloc(bool sr
)
1710 : Output_data_reloc_base
<elfcpp::SHT_RELA
, dynamic
, size
, big_endian
>(sr
)
1713 // Add a reloc against a global symbol.
1716 add_global(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1717 Address address
, Addend addend
)
1718 { this->add(od
, Output_reloc_type(gsym
, type
, od
, address
, addend
,
1722 add_global(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1723 Sized_relobj
<size
, big_endian
>* relobj
,
1724 unsigned int shndx
, Address address
,
1726 { this->add(od
, Output_reloc_type(gsym
, type
, relobj
, shndx
, address
,
1727 addend
, false, false)); }
1729 // Add a RELATIVE reloc against a global symbol. The final output
1730 // relocation will not reference the symbol, but we must keep the symbol
1731 // information long enough to set the addend of the relocation correctly
1732 // when it is written.
1735 add_global_relative(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1736 Address address
, Addend addend
)
1737 { this->add(od
, Output_reloc_type(gsym
, type
, od
, address
, addend
, true,
1741 add_global_relative(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1742 Sized_relobj
<size
, big_endian
>* relobj
,
1743 unsigned int shndx
, Address address
, Addend addend
)
1744 { this->add(od
, Output_reloc_type(gsym
, type
, relobj
, shndx
, address
,
1745 addend
, true, true)); }
1747 // Add a global relocation which does not use a symbol for the relocation,
1748 // but which gets its addend from a symbol.
1751 add_symbolless_global_addend(Symbol
* gsym
, unsigned int type
, Output_data
* od
,
1752 Address address
, Addend addend
)
1753 { this->add(od
, Output_reloc_type(gsym
, type
, od
, address
, addend
,
1757 add_symbolless_global_addend(Symbol
* gsym
, unsigned int type
,
1759 Sized_relobj
<size
, big_endian
>* relobj
,
1760 unsigned int shndx
, Address address
, Addend addend
)
1761 { this->add(od
, Output_reloc_type(gsym
, type
, relobj
, shndx
, address
,
1762 addend
, false, true)); }
1764 // Add a reloc against a local symbol.
1767 add_local(Sized_relobj
<size
, big_endian
>* relobj
,
1768 unsigned int local_sym_index
, unsigned int type
,
1769 Output_data
* od
, Address address
, Addend addend
)
1771 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, od
, address
,
1772 addend
, false, false, false));
1776 add_local(Sized_relobj
<size
, big_endian
>* relobj
,
1777 unsigned int local_sym_index
, unsigned int type
,
1778 Output_data
* od
, unsigned int shndx
, Address address
,
1781 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, shndx
,
1782 address
, addend
, false, false, false));
1785 // Add a RELATIVE reloc against a local symbol.
1788 add_local_relative(Sized_relobj
<size
, big_endian
>* relobj
,
1789 unsigned int local_sym_index
, unsigned int type
,
1790 Output_data
* od
, Address address
, Addend addend
)
1792 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, od
, address
,
1793 addend
, true, true, false));
1797 add_local_relative(Sized_relobj
<size
, big_endian
>* relobj
,
1798 unsigned int local_sym_index
, unsigned int type
,
1799 Output_data
* od
, unsigned int shndx
, Address address
,
1802 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, shndx
,
1803 address
, addend
, true, true, false));
1806 // Add a local relocation which does not use a symbol for the relocation,
1807 // but which gets it's addend from a symbol.
1810 add_symbolless_local_addend(Sized_relobj
<size
, big_endian
>* relobj
,
1811 unsigned int local_sym_index
, unsigned int type
,
1812 Output_data
* od
, Address address
, Addend addend
)
1814 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, od
, address
,
1815 addend
, false, true, false));
1819 add_symbolless_local_addend(Sized_relobj
<size
, big_endian
>* relobj
,
1820 unsigned int local_sym_index
, unsigned int type
,
1821 Output_data
* od
, unsigned int shndx
,
1822 Address address
, Addend addend
)
1824 this->add(od
, Output_reloc_type(relobj
, local_sym_index
, type
, shndx
,
1825 address
, addend
, false, true, false));
1828 // Add a reloc against a local section symbol. This will be
1829 // converted into a reloc against the STT_SECTION symbol of the
1833 add_local_section(Sized_relobj
<size
, big_endian
>* relobj
,
1834 unsigned int input_shndx
, unsigned int type
,
1835 Output_data
* od
, Address address
, Addend addend
)
1837 this->add(od
, Output_reloc_type(relobj
, input_shndx
, type
, od
, address
,
1838 addend
, false, false, true));
1842 add_local_section(Sized_relobj
<size
, big_endian
>* relobj
,
1843 unsigned int input_shndx
, unsigned int type
,
1844 Output_data
* od
, unsigned int shndx
, Address address
,
1847 this->add(od
, Output_reloc_type(relobj
, input_shndx
, type
, shndx
,
1848 address
, addend
, false, false, true));
1851 // A reloc against the STT_SECTION symbol of an output section.
1854 add_output_section(Output_section
* os
, unsigned int type
, Output_data
* od
,
1855 Address address
, Addend addend
)
1856 { this->add(od
, Output_reloc_type(os
, type
, od
, address
, addend
)); }
1859 add_output_section(Output_section
* os
, unsigned int type
, Output_data
* od
,
1860 Sized_relobj
<size
, big_endian
>* relobj
,
1861 unsigned int shndx
, Address address
, Addend addend
)
1862 { this->add(od
, Output_reloc_type(os
, type
, relobj
, shndx
, address
,
1865 // Add an absolute relocation.
1868 add_absolute(unsigned int type
, Output_data
* od
, Address address
,
1870 { this->add(od
, Output_reloc_type(type
, od
, address
, addend
)); }
1873 add_absolute(unsigned int type
, Output_data
* od
,
1874 Sized_relobj
<size
, big_endian
>* relobj
,
1875 unsigned int shndx
, Address address
, Addend addend
)
1876 { this->add(od
, Output_reloc_type(type
, relobj
, shndx
, address
, addend
)); }
1878 // Add a target specific relocation. A target which calls this must
1879 // define the reloc_symbol_index and reloc_addend virtual functions.
1882 add_target_specific(unsigned int type
, void* arg
, Output_data
* od
,
1883 Address address
, Addend addend
)
1884 { this->add(od
, Output_reloc_type(type
, arg
, od
, address
, addend
)); }
1887 add_target_specific(unsigned int type
, void* arg
, Output_data
* od
,
1888 Sized_relobj
<size
, big_endian
>* relobj
,
1889 unsigned int shndx
, Address address
, Addend addend
)
1891 this->add(od
, Output_reloc_type(type
, arg
, relobj
, shndx
, address
,
1896 // Output_relocatable_relocs represents a relocation section in a
1897 // relocatable link. The actual data is written out in the target
1898 // hook relocate_for_relocatable. This just saves space for it.
1900 template<int sh_type
, int size
, bool big_endian
>
1901 class Output_relocatable_relocs
: public Output_section_data
1904 Output_relocatable_relocs(Relocatable_relocs
* rr
)
1905 : Output_section_data(Output_data::default_alignment_for_size(size
)),
1910 set_final_data_size();
1912 // Write out the data. There is nothing to do here.
1914 do_write(Output_file
*)
1917 // Write to a map file.
1919 do_print_to_mapfile(Mapfile
* mapfile
) const
1920 { mapfile
->print_output_data(this, _("** relocs")); }
1923 // The relocs associated with this input section.
1924 Relocatable_relocs
* rr_
;
1927 // Handle a GROUP section.
1929 template<int size
, bool big_endian
>
1930 class Output_data_group
: public Output_section_data
1933 // The constructor clears *INPUT_SHNDXES.
1934 Output_data_group(Sized_relobj_file
<size
, big_endian
>* relobj
,
1935 section_size_type entry_count
,
1936 elfcpp::Elf_Word flags
,
1937 std::vector
<unsigned int>* input_shndxes
);
1940 do_write(Output_file
*);
1942 // Write to a map file.
1944 do_print_to_mapfile(Mapfile
* mapfile
) const
1945 { mapfile
->print_output_data(this, _("** group")); }
1947 // Set final data size.
1949 set_final_data_size()
1950 { this->set_data_size((this->input_shndxes_
.size() + 1) * 4); }
1953 // The input object.
1954 Sized_relobj_file
<size
, big_endian
>* relobj_
;
1955 // The group flag word.
1956 elfcpp::Elf_Word flags_
;
1957 // The section indexes of the input sections in this group.
1958 std::vector
<unsigned int> input_shndxes_
;
1961 // Output_data_got is used to manage a GOT. Each entry in the GOT is
1962 // for one symbol--either a global symbol or a local symbol in an
1963 // object. The target specific code adds entries to the GOT as
1966 template<int size
, bool big_endian
>
1967 class Output_data_got
: public Output_section_data_build
1970 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Valtype
;
1971 typedef Output_data_reloc
<elfcpp::SHT_REL
, true, size
, big_endian
> Rel_dyn
;
1972 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
> Rela_dyn
;
1975 : Output_section_data_build(Output_data::default_alignment_for_size(size
)),
1976 entries_(), free_list_()
1979 Output_data_got(off_t data_size
)
1980 : Output_section_data_build(data_size
,
1981 Output_data::default_alignment_for_size(size
)),
1982 entries_(), free_list_()
1984 // For an incremental update, we have an existing GOT section.
1985 // Initialize the list of entries and the free list.
1986 this->entries_
.resize(data_size
/ (size
/ 8));
1987 this->free_list_
.init(data_size
, false);
1990 // Add an entry for a global symbol to the GOT. Return true if this
1991 // is a new GOT entry, false if the symbol was already in the GOT.
1993 add_global(Symbol
* gsym
, unsigned int got_type
);
1995 // Like add_global, but use the PLT offset of the global symbol if
1998 add_global_plt(Symbol
* gsym
, unsigned int got_type
);
2000 // Add an entry for a global symbol to the GOT, and add a dynamic
2001 // relocation of type R_TYPE for the GOT entry.
2003 add_global_with_rel(Symbol
* gsym
, unsigned int got_type
,
2004 Rel_dyn
* rel_dyn
, unsigned int r_type
);
2007 add_global_with_rela(Symbol
* gsym
, unsigned int got_type
,
2008 Rela_dyn
* rela_dyn
, unsigned int r_type
);
2010 // Add a pair of entries for a global symbol to the GOT, and add
2011 // dynamic relocations of type R_TYPE_1 and R_TYPE_2, respectively.
2013 add_global_pair_with_rel(Symbol
* gsym
, unsigned int got_type
,
2014 Rel_dyn
* rel_dyn
, unsigned int r_type_1
,
2015 unsigned int r_type_2
);
2018 add_global_pair_with_rela(Symbol
* gsym
, unsigned int got_type
,
2019 Rela_dyn
* rela_dyn
, unsigned int r_type_1
,
2020 unsigned int r_type_2
);
2022 // Add an entry for a local symbol to the GOT. This returns true if
2023 // this is a new GOT entry, false if the symbol already has a GOT
2026 add_local(Sized_relobj_file
<size
, big_endian
>* object
, unsigned int sym_index
,
2027 unsigned int got_type
);
2029 // Like add_local, but use the PLT offset of the local symbol if it
2032 add_local_plt(Sized_relobj_file
<size
, big_endian
>* object
,
2033 unsigned int sym_index
,
2034 unsigned int got_type
);
2036 // Add an entry for a local symbol to the GOT, and add a dynamic
2037 // relocation of type R_TYPE for the GOT entry.
2039 add_local_with_rel(Sized_relobj_file
<size
, big_endian
>* object
,
2040 unsigned int sym_index
, unsigned int got_type
,
2041 Rel_dyn
* rel_dyn
, unsigned int r_type
);
2044 add_local_with_rela(Sized_relobj_file
<size
, big_endian
>* object
,
2045 unsigned int sym_index
, unsigned int got_type
,
2046 Rela_dyn
* rela_dyn
, unsigned int r_type
);
2048 // Add a pair of entries for a local symbol to the GOT, and add
2049 // dynamic relocations of type R_TYPE_1 and R_TYPE_2, respectively.
2051 add_local_pair_with_rel(Sized_relobj_file
<size
, big_endian
>* object
,
2052 unsigned int sym_index
, unsigned int shndx
,
2053 unsigned int got_type
, Rel_dyn
* rel_dyn
,
2054 unsigned int r_type_1
, unsigned int r_type_2
);
2057 add_local_pair_with_rela(Sized_relobj_file
<size
, big_endian
>* object
,
2058 unsigned int sym_index
, unsigned int shndx
,
2059 unsigned int got_type
, Rela_dyn
* rela_dyn
,
2060 unsigned int r_type_1
, unsigned int r_type_2
);
2062 // Add a constant to the GOT. This returns the offset of the new
2063 // entry from the start of the GOT.
2065 add_constant(Valtype constant
)
2067 unsigned int got_offset
= this->add_got_entry(Got_entry(constant
));
2071 // Reserve a slot in the GOT.
2073 reserve_slot(unsigned int i
)
2074 { this->free_list_
.remove(i
* size
/ 8, (i
+ 1) * size
/ 8); }
2076 // Reserve a slot in the GOT for a local symbol.
2078 reserve_local(unsigned int i
, Sized_relobj
<size
, big_endian
>* object
,
2079 unsigned int sym_index
, unsigned int got_type
);
2081 // Reserve a slot in the GOT for a global symbol.
2083 reserve_global(unsigned int i
, Symbol
* gsym
, unsigned int got_type
);
2086 // Write out the GOT table.
2088 do_write(Output_file
*);
2090 // Write to a map file.
2092 do_print_to_mapfile(Mapfile
* mapfile
) const
2093 { mapfile
->print_output_data(this, _("** GOT")); }
2096 // This POD class holds a single GOT entry.
2100 // Create a zero entry.
2102 : local_sym_index_(RESERVED_CODE
), use_plt_offset_(false)
2103 { this->u_
.constant
= 0; }
2105 // Create a global symbol entry.
2106 Got_entry(Symbol
* gsym
, bool use_plt_offset
)
2107 : local_sym_index_(GSYM_CODE
), use_plt_offset_(use_plt_offset
)
2108 { this->u_
.gsym
= gsym
; }
2110 // Create a local symbol entry.
2111 Got_entry(Sized_relobj_file
<size
, big_endian
>* object
,
2112 unsigned int local_sym_index
, bool use_plt_offset
)
2113 : local_sym_index_(local_sym_index
), use_plt_offset_(use_plt_offset
)
2115 gold_assert(local_sym_index
!= GSYM_CODE
2116 && local_sym_index
!= CONSTANT_CODE
2117 && local_sym_index
!= RESERVED_CODE
2118 && local_sym_index
== this->local_sym_index_
);
2119 this->u_
.object
= object
;
2122 // Create a constant entry. The constant is a host value--it will
2123 // be swapped, if necessary, when it is written out.
2124 explicit Got_entry(Valtype constant
)
2125 : local_sym_index_(CONSTANT_CODE
), use_plt_offset_(false)
2126 { this->u_
.constant
= constant
; }
2128 // Write the GOT entry to an output view.
2130 write(unsigned char* pov
) const;
2135 GSYM_CODE
= 0x7fffffff,
2136 CONSTANT_CODE
= 0x7ffffffe,
2137 RESERVED_CODE
= 0x7ffffffd
2142 // For a local symbol, the object.
2143 Sized_relobj_file
<size
, big_endian
>* object
;
2144 // For a global symbol, the symbol.
2146 // For a constant, the constant.
2149 // For a local symbol, the local symbol index. This is GSYM_CODE
2150 // for a global symbol, or CONSTANT_CODE for a constant.
2151 unsigned int local_sym_index_
: 31;
2152 // Whether to use the PLT offset of the symbol if it has one.
2153 bool use_plt_offset_
: 1;
2156 typedef std::vector
<Got_entry
> Got_entries
;
2158 // Create a new GOT entry and return its offset.
2160 add_got_entry(Got_entry got_entry
);
2162 // Create a pair of new GOT entries and return the offset of the first.
2164 add_got_entry_pair(Got_entry got_entry_1
, Got_entry got_entry_2
);
2166 // Return the offset into the GOT of GOT entry I.
2168 got_offset(unsigned int i
) const
2169 { return i
* (size
/ 8); }
2171 // Return the offset into the GOT of the last entry added.
2173 last_got_offset() const
2174 { return this->got_offset(this->entries_
.size() - 1); }
2176 // Set the size of the section.
2179 { this->set_current_data_size(this->got_offset(this->entries_
.size())); }
2181 // The list of GOT entries.
2182 Got_entries entries_
;
2184 // List of available regions within the section, for incremental
2186 Free_list free_list_
;
2189 // Output_data_dynamic is used to hold the data in SHT_DYNAMIC
2192 class Output_data_dynamic
: public Output_section_data
2195 Output_data_dynamic(Stringpool
* pool
)
2196 : Output_section_data(Output_data::default_alignment()),
2197 entries_(), pool_(pool
)
2200 // Add a new dynamic entry with a fixed numeric value.
2202 add_constant(elfcpp::DT tag
, unsigned int val
)
2203 { this->add_entry(Dynamic_entry(tag
, val
)); }
2205 // Add a new dynamic entry with the address of output data.
2207 add_section_address(elfcpp::DT tag
, const Output_data
* od
)
2208 { this->add_entry(Dynamic_entry(tag
, od
, false)); }
2210 // Add a new dynamic entry with the address of output data
2211 // plus a constant offset.
2213 add_section_plus_offset(elfcpp::DT tag
, const Output_data
* od
,
2214 unsigned int offset
)
2215 { this->add_entry(Dynamic_entry(tag
, od
, offset
)); }
2217 // Add a new dynamic entry with the size of output data.
2219 add_section_size(elfcpp::DT tag
, const Output_data
* od
)
2220 { this->add_entry(Dynamic_entry(tag
, od
, true)); }
2222 // Add a new dynamic entry with the total size of two output datas.
2224 add_section_size(elfcpp::DT tag
, const Output_data
* od
,
2225 const Output_data
* od2
)
2226 { this->add_entry(Dynamic_entry(tag
, od
, od2
)); }
2228 // Add a new dynamic entry with the address of a symbol.
2230 add_symbol(elfcpp::DT tag
, const Symbol
* sym
)
2231 { this->add_entry(Dynamic_entry(tag
, sym
)); }
2233 // Add a new dynamic entry with a string.
2235 add_string(elfcpp::DT tag
, const char* str
)
2236 { this->add_entry(Dynamic_entry(tag
, this->pool_
->add(str
, true, NULL
))); }
2239 add_string(elfcpp::DT tag
, const std::string
& str
)
2240 { this->add_string(tag
, str
.c_str()); }
2243 // Adjust the output section to set the entry size.
2245 do_adjust_output_section(Output_section
*);
2247 // Set the final data size.
2249 set_final_data_size();
2251 // Write out the dynamic entries.
2253 do_write(Output_file
*);
2255 // Write to a map file.
2257 do_print_to_mapfile(Mapfile
* mapfile
) const
2258 { mapfile
->print_output_data(this, _("** dynamic")); }
2261 // This POD class holds a single dynamic entry.
2265 // Create an entry with a fixed numeric value.
2266 Dynamic_entry(elfcpp::DT tag
, unsigned int val
)
2267 : tag_(tag
), offset_(DYNAMIC_NUMBER
)
2268 { this->u_
.val
= val
; }
2270 // Create an entry with the size or address of a section.
2271 Dynamic_entry(elfcpp::DT tag
, const Output_data
* od
, bool section_size
)
2273 offset_(section_size
2274 ? DYNAMIC_SECTION_SIZE
2275 : DYNAMIC_SECTION_ADDRESS
)
2281 // Create an entry with the size of two sections.
2282 Dynamic_entry(elfcpp::DT tag
, const Output_data
* od
, const Output_data
* od2
)
2284 offset_(DYNAMIC_SECTION_SIZE
)
2290 // Create an entry with the address of a section plus a constant offset.
2291 Dynamic_entry(elfcpp::DT tag
, const Output_data
* od
, unsigned int offset
)
2294 { this->u_
.od
= od
; }
2296 // Create an entry with the address of a symbol.
2297 Dynamic_entry(elfcpp::DT tag
, const Symbol
* sym
)
2298 : tag_(tag
), offset_(DYNAMIC_SYMBOL
)
2299 { this->u_
.sym
= sym
; }
2301 // Create an entry with a string.
2302 Dynamic_entry(elfcpp::DT tag
, const char* str
)
2303 : tag_(tag
), offset_(DYNAMIC_STRING
)
2304 { this->u_
.str
= str
; }
2306 // Return the tag of this entry.
2309 { return this->tag_
; }
2311 // Write the dynamic entry to an output view.
2312 template<int size
, bool big_endian
>
2314 write(unsigned char* pov
, const Stringpool
*) const;
2317 // Classification is encoded in the OFFSET field.
2321 DYNAMIC_SECTION_ADDRESS
= 0,
2323 DYNAMIC_NUMBER
= -1U,
2325 DYNAMIC_SECTION_SIZE
= -2U,
2327 DYNAMIC_SYMBOL
= -3U,
2329 DYNAMIC_STRING
= -4U
2330 // Any other value indicates a section address plus OFFSET.
2335 // For DYNAMIC_NUMBER.
2337 // For DYNAMIC_SECTION_SIZE and section address plus OFFSET.
2338 const Output_data
* od
;
2339 // For DYNAMIC_SYMBOL.
2341 // For DYNAMIC_STRING.
2344 // For DYNAMIC_SYMBOL with two sections.
2345 const Output_data
* od2
;
2348 // The type of entry (Classification) or offset within a section.
2349 unsigned int offset_
;
2352 // Add an entry to the list.
2354 add_entry(const Dynamic_entry
& entry
)
2355 { this->entries_
.push_back(entry
); }
2357 // Sized version of write function.
2358 template<int size
, bool big_endian
>
2360 sized_write(Output_file
* of
);
2362 // The type of the list of entries.
2363 typedef std::vector
<Dynamic_entry
> Dynamic_entries
;
2366 Dynamic_entries entries_
;
2367 // The pool used for strings.
2371 // Output_symtab_xindex is used to handle SHT_SYMTAB_SHNDX sections,
2372 // which may be required if the object file has more than
2373 // SHN_LORESERVE sections.
2375 class Output_symtab_xindex
: public Output_section_data
2378 Output_symtab_xindex(size_t symcount
)
2379 : Output_section_data(symcount
* 4, 4, true),
2383 // Add an entry: symbol number SYMNDX has section SHNDX.
2385 add(unsigned int symndx
, unsigned int shndx
)
2386 { this->entries_
.push_back(std::make_pair(symndx
, shndx
)); }
2390 do_write(Output_file
*);
2392 // Write to a map file.
2394 do_print_to_mapfile(Mapfile
* mapfile
) const
2395 { mapfile
->print_output_data(this, _("** symtab xindex")); }
2398 template<bool big_endian
>
2400 endian_do_write(unsigned char*);
2402 // It is likely that most symbols will not require entries. Rather
2403 // than keep a vector for all symbols, we keep pairs of symbol index
2404 // and section index.
2405 typedef std::vector
<std::pair
<unsigned int, unsigned int> > Xindex_entries
;
2407 // The entries we need.
2408 Xindex_entries entries_
;
2411 // A relaxed input section.
2412 class Output_relaxed_input_section
: public Output_section_data_build
2415 // We would like to call relobj->section_addralign(shndx) to get the
2416 // alignment but we do not want the constructor to fail. So callers
2417 // are repsonsible for ensuring that.
2418 Output_relaxed_input_section(Relobj
* relobj
, unsigned int shndx
,
2420 : Output_section_data_build(addralign
), relobj_(relobj
), shndx_(shndx
)
2423 // Return the Relobj of this relaxed input section.
2426 { return this->relobj_
; }
2428 // Return the section index of this relaxed input section.
2431 { return this->shndx_
; }
2435 unsigned int shndx_
;
2438 // This class describes properties of merge data sections. It is used
2439 // as a key type for maps.
2440 class Merge_section_properties
2443 Merge_section_properties(bool is_string
, uint64_t entsize
,
2445 : is_string_(is_string
), entsize_(entsize
), addralign_(addralign
)
2448 // Whether this equals to another Merge_section_properties MSP.
2450 eq(const Merge_section_properties
& msp
) const
2452 return ((this->is_string_
== msp
.is_string_
)
2453 && (this->entsize_
== msp
.entsize_
)
2454 && (this->addralign_
== msp
.addralign_
));
2457 // Compute a hash value for this using 64-bit FNV-1a hash.
2461 uint64_t h
= 14695981039346656037ULL; // FNV offset basis.
2462 uint64_t prime
= 1099511628211ULL;
2463 h
= (h
^ static_cast<uint64_t>(this->is_string_
)) * prime
;
2464 h
= (h
^ static_cast<uint64_t>(this->entsize_
)) * prime
;
2465 h
= (h
^ static_cast<uint64_t>(this->addralign_
)) * prime
;
2469 // Functors for associative containers.
2473 operator()(const Merge_section_properties
& msp1
,
2474 const Merge_section_properties
& msp2
) const
2475 { return msp1
.eq(msp2
); }
2481 operator()(const Merge_section_properties
& msp
) const
2482 { return msp
.hash_value(); }
2486 // Whether this merge data section is for strings.
2488 // Entsize of this merge data section.
2490 // Address alignment.
2491 uint64_t addralign_
;
2494 // This class is used to speed up look up of special input sections in an
2497 class Output_section_lookup_maps
2500 Output_section_lookup_maps()
2501 : is_valid_(true), merge_sections_by_properties_(),
2502 merge_sections_by_id_(), relaxed_input_sections_by_id_()
2505 // Whether the maps are valid.
2508 { return this->is_valid_
; }
2510 // Invalidate the maps.
2513 { this->is_valid_
= false; }
2519 this->merge_sections_by_properties_
.clear();
2520 this->merge_sections_by_id_
.clear();
2521 this->relaxed_input_sections_by_id_
.clear();
2522 // A cleared map is valid.
2523 this->is_valid_
= true;
2526 // Find a merge section by merge section properties. Return NULL if none
2529 find_merge_section(const Merge_section_properties
& msp
) const
2531 gold_assert(this->is_valid_
);
2532 Merge_sections_by_properties::const_iterator p
=
2533 this->merge_sections_by_properties_
.find(msp
);
2534 return p
!= this->merge_sections_by_properties_
.end() ? p
->second
: NULL
;
2537 // Find a merge section by section ID of a merge input section. Return NULL
2538 // if none is found.
2540 find_merge_section(const Object
* object
, unsigned int shndx
) const
2542 gold_assert(this->is_valid_
);
2543 Merge_sections_by_id::const_iterator p
=
2544 this->merge_sections_by_id_
.find(Const_section_id(object
, shndx
));
2545 return p
!= this->merge_sections_by_id_
.end() ? p
->second
: NULL
;
2548 // Add a merge section pointed by POMB with properties MSP.
2550 add_merge_section(const Merge_section_properties
& msp
,
2551 Output_merge_base
* pomb
)
2553 std::pair
<Merge_section_properties
, Output_merge_base
*> value(msp
, pomb
);
2554 std::pair
<Merge_sections_by_properties::iterator
, bool> result
=
2555 this->merge_sections_by_properties_
.insert(value
);
2556 gold_assert(result
.second
);
2559 // Add a mapping from a merged input section in OBJECT with index SHNDX
2560 // to a merge output section pointed by POMB.
2562 add_merge_input_section(const Object
* object
, unsigned int shndx
,
2563 Output_merge_base
* pomb
)
2565 Const_section_id
csid(object
, shndx
);
2566 std::pair
<Const_section_id
, Output_merge_base
*> value(csid
, pomb
);
2567 std::pair
<Merge_sections_by_id::iterator
, bool> result
=
2568 this->merge_sections_by_id_
.insert(value
);
2569 gold_assert(result
.second
);
2572 // Find a relaxed input section of OBJECT with index SHNDX.
2573 Output_relaxed_input_section
*
2574 find_relaxed_input_section(const Object
* object
, unsigned int shndx
) const
2576 gold_assert(this->is_valid_
);
2577 Relaxed_input_sections_by_id::const_iterator p
=
2578 this->relaxed_input_sections_by_id_
.find(Const_section_id(object
, shndx
));
2579 return p
!= this->relaxed_input_sections_by_id_
.end() ? p
->second
: NULL
;
2582 // Add a relaxed input section pointed by POMB and whose original input
2583 // section is in OBJECT with index SHNDX.
2585 add_relaxed_input_section(const Relobj
* relobj
, unsigned int shndx
,
2586 Output_relaxed_input_section
* poris
)
2588 Const_section_id
csid(relobj
, shndx
);
2589 std::pair
<Const_section_id
, Output_relaxed_input_section
*>
2591 std::pair
<Relaxed_input_sections_by_id::iterator
, bool> result
=
2592 this->relaxed_input_sections_by_id_
.insert(value
);
2593 gold_assert(result
.second
);
2597 typedef Unordered_map
<Const_section_id
, Output_merge_base
*,
2598 Const_section_id_hash
>
2599 Merge_sections_by_id
;
2601 typedef Unordered_map
<Merge_section_properties
, Output_merge_base
*,
2602 Merge_section_properties::hash
,
2603 Merge_section_properties::equal_to
>
2604 Merge_sections_by_properties
;
2606 typedef Unordered_map
<Const_section_id
, Output_relaxed_input_section
*,
2607 Const_section_id_hash
>
2608 Relaxed_input_sections_by_id
;
2610 // Whether this is valid
2612 // Merge sections by merge section properties.
2613 Merge_sections_by_properties merge_sections_by_properties_
;
2614 // Merge sections by section IDs.
2615 Merge_sections_by_id merge_sections_by_id_
;
2616 // Relaxed sections by section IDs.
2617 Relaxed_input_sections_by_id relaxed_input_sections_by_id_
;
2620 // An output section. We don't expect to have too many output
2621 // sections, so we don't bother to do a template on the size.
2623 class Output_section
: public Output_data
2626 // Create an output section, giving the name, type, and flags.
2627 Output_section(const char* name
, elfcpp::Elf_Word
, elfcpp::Elf_Xword
);
2628 virtual ~Output_section();
2630 // Add a new input section SHNDX, named NAME, with header SHDR, from
2631 // object OBJECT. RELOC_SHNDX is the index of a relocation section
2632 // which applies to this section, or 0 if none, or -1 if more than
2633 // one. HAVE_SECTIONS_SCRIPT is true if we have a SECTIONS clause
2634 // in a linker script; in that case we need to keep track of input
2635 // sections associated with an output section. Return the offset
2636 // within the output section.
2637 template<int size
, bool big_endian
>
2639 add_input_section(Layout
* layout
, Sized_relobj_file
<size
, big_endian
>* object
,
2640 unsigned int shndx
, const char* name
,
2641 const elfcpp::Shdr
<size
, big_endian
>& shdr
,
2642 unsigned int reloc_shndx
, bool have_sections_script
);
2644 // Add generated data POSD to this output section.
2646 add_output_section_data(Output_section_data
* posd
);
2648 // Add a relaxed input section PORIS called NAME to this output section
2651 add_relaxed_input_section(Layout
* layout
,
2652 Output_relaxed_input_section
* poris
,
2653 const std::string
& name
);
2655 // Return the section name.
2658 { return this->name_
; }
2660 // Return the section type.
2663 { return this->type_
; }
2665 // Return the section flags.
2668 { return this->flags_
; }
2670 // Update the output section flags based on input section flags.
2672 update_flags_for_input_section(elfcpp::Elf_Xword flags
);
2674 // Return the entsize field.
2677 { return this->entsize_
; }
2679 // Set the entsize field.
2681 set_entsize(uint64_t v
);
2683 // Set the load address.
2685 set_load_address(uint64_t load_address
)
2687 this->load_address_
= load_address
;
2688 this->has_load_address_
= true;
2691 // Set the link field to the output section index of a section.
2693 set_link_section(const Output_data
* od
)
2695 gold_assert(this->link_
== 0
2696 && !this->should_link_to_symtab_
2697 && !this->should_link_to_dynsym_
);
2698 this->link_section_
= od
;
2701 // Set the link field to a constant.
2703 set_link(unsigned int v
)
2705 gold_assert(this->link_section_
== NULL
2706 && !this->should_link_to_symtab_
2707 && !this->should_link_to_dynsym_
);
2711 // Record that this section should link to the normal symbol table.
2713 set_should_link_to_symtab()
2715 gold_assert(this->link_section_
== NULL
2717 && !this->should_link_to_dynsym_
);
2718 this->should_link_to_symtab_
= true;
2721 // Record that this section should link to the dynamic symbol table.
2723 set_should_link_to_dynsym()
2725 gold_assert(this->link_section_
== NULL
2727 && !this->should_link_to_symtab_
);
2728 this->should_link_to_dynsym_
= true;
2731 // Return the info field.
2735 gold_assert(this->info_section_
== NULL
2736 && this->info_symndx_
== NULL
);
2740 // Set the info field to the output section index of a section.
2742 set_info_section(const Output_section
* os
)
2744 gold_assert((this->info_section_
== NULL
2745 || (this->info_section_
== os
2746 && this->info_uses_section_index_
))
2747 && this->info_symndx_
== NULL
2748 && this->info_
== 0);
2749 this->info_section_
= os
;
2750 this->info_uses_section_index_
= true;
2753 // Set the info field to the symbol table index of a symbol.
2755 set_info_symndx(const Symbol
* sym
)
2757 gold_assert(this->info_section_
== NULL
2758 && (this->info_symndx_
== NULL
2759 || this->info_symndx_
== sym
)
2760 && this->info_
== 0);
2761 this->info_symndx_
= sym
;
2764 // Set the info field to the symbol table index of a section symbol.
2766 set_info_section_symndx(const Output_section
* os
)
2768 gold_assert((this->info_section_
== NULL
2769 || (this->info_section_
== os
2770 && !this->info_uses_section_index_
))
2771 && this->info_symndx_
== NULL
2772 && this->info_
== 0);
2773 this->info_section_
= os
;
2774 this->info_uses_section_index_
= false;
2777 // Set the info field to a constant.
2779 set_info(unsigned int v
)
2781 gold_assert(this->info_section_
== NULL
2782 && this->info_symndx_
== NULL
2783 && (this->info_
== 0
2784 || this->info_
== v
));
2788 // Set the addralign field.
2790 set_addralign(uint64_t v
)
2791 { this->addralign_
= v
; }
2793 // Whether the output section index has been set.
2795 has_out_shndx() const
2796 { return this->out_shndx_
!= -1U; }
2798 // Indicate that we need a symtab index.
2800 set_needs_symtab_index()
2801 { this->needs_symtab_index_
= true; }
2803 // Return whether we need a symtab index.
2805 needs_symtab_index() const
2806 { return this->needs_symtab_index_
; }
2808 // Get the symtab index.
2810 symtab_index() const
2812 gold_assert(this->symtab_index_
!= 0);
2813 return this->symtab_index_
;
2816 // Set the symtab index.
2818 set_symtab_index(unsigned int index
)
2820 gold_assert(index
!= 0);
2821 this->symtab_index_
= index
;
2824 // Indicate that we need a dynsym index.
2826 set_needs_dynsym_index()
2827 { this->needs_dynsym_index_
= true; }
2829 // Return whether we need a dynsym index.
2831 needs_dynsym_index() const
2832 { return this->needs_dynsym_index_
; }
2834 // Get the dynsym index.
2836 dynsym_index() const
2838 gold_assert(this->dynsym_index_
!= 0);
2839 return this->dynsym_index_
;
2842 // Set the dynsym index.
2844 set_dynsym_index(unsigned int index
)
2846 gold_assert(index
!= 0);
2847 this->dynsym_index_
= index
;
2850 // Return whether the input sections sections attachd to this output
2851 // section may require sorting. This is used to handle constructor
2852 // priorities compatibly with GNU ld.
2854 may_sort_attached_input_sections() const
2855 { return this->may_sort_attached_input_sections_
; }
2857 // Record that the input sections attached to this output section
2858 // may require sorting.
2860 set_may_sort_attached_input_sections()
2861 { this->may_sort_attached_input_sections_
= true; }
2863 // Returns true if input sections must be sorted according to the
2864 // order in which their name appear in the --section-ordering-file.
2866 input_section_order_specified()
2867 { return this->input_section_order_specified_
; }
2869 // Record that input sections must be sorted as some of their names
2870 // match the patterns specified through --section-ordering-file.
2872 set_input_section_order_specified()
2873 { this->input_section_order_specified_
= true; }
2875 // Return whether the input sections attached to this output section
2876 // require sorting. This is used to handle constructor priorities
2877 // compatibly with GNU ld.
2879 must_sort_attached_input_sections() const
2880 { return this->must_sort_attached_input_sections_
; }
2882 // Record that the input sections attached to this output section
2885 set_must_sort_attached_input_sections()
2886 { this->must_sort_attached_input_sections_
= true; }
2888 // Get the order in which this section appears in the PT_LOAD output
2890 Output_section_order
2892 { return this->order_
; }
2894 // Set the order for this section.
2896 set_order(Output_section_order order
)
2897 { this->order_
= order
; }
2899 // Return whether this section holds relro data--data which has
2900 // dynamic relocations but which may be marked read-only after the
2901 // dynamic relocations have been completed.
2904 { return this->is_relro_
; }
2906 // Record that this section holds relro data.
2909 { this->is_relro_
= true; }
2911 // Record that this section does not hold relro data.
2914 { this->is_relro_
= false; }
2916 // True if this is a small section: a section which holds small
2919 is_small_section() const
2920 { return this->is_small_section_
; }
2922 // Record that this is a small section.
2924 set_is_small_section()
2925 { this->is_small_section_
= true; }
2927 // True if this is a large section: a section which holds large
2930 is_large_section() const
2931 { return this->is_large_section_
; }
2933 // Record that this is a large section.
2935 set_is_large_section()
2936 { this->is_large_section_
= true; }
2938 // True if this is a large data (not BSS) section.
2940 is_large_data_section()
2941 { return this->is_large_section_
&& this->type_
!= elfcpp::SHT_NOBITS
; }
2943 // Return whether this section should be written after all the input
2944 // sections are complete.
2946 after_input_sections() const
2947 { return this->after_input_sections_
; }
2949 // Record that this section should be written after all the input
2950 // sections are complete.
2952 set_after_input_sections()
2953 { this->after_input_sections_
= true; }
2955 // Return whether this section requires postprocessing after all
2956 // relocations have been applied.
2958 requires_postprocessing() const
2959 { return this->requires_postprocessing_
; }
2961 // If a section requires postprocessing, return the buffer to use.
2963 postprocessing_buffer() const
2965 gold_assert(this->postprocessing_buffer_
!= NULL
);
2966 return this->postprocessing_buffer_
;
2969 // If a section requires postprocessing, create the buffer to use.
2971 create_postprocessing_buffer();
2973 // If a section requires postprocessing, this is the size of the
2974 // buffer to which relocations should be applied.
2976 postprocessing_buffer_size() const
2977 { return this->current_data_size_for_child(); }
2979 // Modify the section name. This is only permitted for an
2980 // unallocated section, and only before the size has been finalized.
2981 // Otherwise the name will not get into Layout::namepool_.
2983 set_name(const char* newname
)
2985 gold_assert((this->flags_
& elfcpp::SHF_ALLOC
) == 0);
2986 gold_assert(!this->is_data_size_valid());
2987 this->name_
= newname
;
2990 // Return whether the offset OFFSET in the input section SHNDX in
2991 // object OBJECT is being included in the link.
2993 is_input_address_mapped(const Relobj
* object
, unsigned int shndx
,
2994 off_t offset
) const;
2996 // Return the offset within the output section of OFFSET relative to
2997 // the start of input section SHNDX in object OBJECT.
2999 output_offset(const Relobj
* object
, unsigned int shndx
,
3000 section_offset_type offset
) const;
3002 // Return the output virtual address of OFFSET relative to the start
3003 // of input section SHNDX in object OBJECT.
3005 output_address(const Relobj
* object
, unsigned int shndx
,
3006 off_t offset
) const;
3008 // Look for the merged section for input section SHNDX in object
3009 // OBJECT. If found, return true, and set *ADDR to the address of
3010 // the start of the merged section. This is not necessary the
3011 // output offset corresponding to input offset 0 in the section,
3012 // since the section may be mapped arbitrarily.
3014 find_starting_output_address(const Relobj
* object
, unsigned int shndx
,
3015 uint64_t* addr
) const;
3017 // Record that this output section was found in the SECTIONS clause
3018 // of a linker script.
3020 set_found_in_sections_clause()
3021 { this->found_in_sections_clause_
= true; }
3023 // Return whether this output section was found in the SECTIONS
3024 // clause of a linker script.
3026 found_in_sections_clause() const
3027 { return this->found_in_sections_clause_
; }
3029 // Write the section header into *OPHDR.
3030 template<int size
, bool big_endian
>
3032 write_header(const Layout
*, const Stringpool
*,
3033 elfcpp::Shdr_write
<size
, big_endian
>*) const;
3035 // The next few calls are for linker script support.
3037 // In some cases we need to keep a list of the input sections
3038 // associated with this output section. We only need the list if we
3039 // might have to change the offsets of the input section within the
3040 // output section after we add the input section. The ordinary
3041 // input sections will be written out when we process the object
3042 // file, and as such we don't need to track them here. We do need
3043 // to track Output_section_data objects here. We store instances of
3044 // this structure in a std::vector, so it must be a POD. There can
3045 // be many instances of this structure, so we use a union to save
3051 : shndx_(0), p2align_(0)
3053 this->u1_
.data_size
= 0;
3054 this->u2_
.object
= NULL
;
3057 // For an ordinary input section.
3058 Input_section(Relobj
* object
, unsigned int shndx
, off_t data_size
,
3061 p2align_(ffsll(static_cast<long long>(addralign
))),
3062 section_order_index_(0)
3064 gold_assert(shndx
!= OUTPUT_SECTION_CODE
3065 && shndx
!= MERGE_DATA_SECTION_CODE
3066 && shndx
!= MERGE_STRING_SECTION_CODE
3067 && shndx
!= RELAXED_INPUT_SECTION_CODE
);
3068 this->u1_
.data_size
= data_size
;
3069 this->u2_
.object
= object
;
3072 // For a non-merge output section.
3073 Input_section(Output_section_data
* posd
)
3074 : shndx_(OUTPUT_SECTION_CODE
), p2align_(0),
3075 section_order_index_(0)
3077 this->u1_
.data_size
= 0;
3078 this->u2_
.posd
= posd
;
3081 // For a merge section.
3082 Input_section(Output_section_data
* posd
, bool is_string
, uint64_t entsize
)
3084 ? MERGE_STRING_SECTION_CODE
3085 : MERGE_DATA_SECTION_CODE
),
3087 section_order_index_(0)
3089 this->u1_
.entsize
= entsize
;
3090 this->u2_
.posd
= posd
;
3093 // For a relaxed input section.
3094 Input_section(Output_relaxed_input_section
* psection
)
3095 : shndx_(RELAXED_INPUT_SECTION_CODE
), p2align_(0),
3096 section_order_index_(0)
3098 this->u1_
.data_size
= 0;
3099 this->u2_
.poris
= psection
;
3103 section_order_index() const
3105 return this->section_order_index_
;
3109 set_section_order_index(unsigned int number
)
3111 this->section_order_index_
= number
;
3114 // The required alignment.
3118 if (this->p2align_
!= 0)
3119 return static_cast<uint64_t>(1) << (this->p2align_
- 1);
3120 else if (!this->is_input_section())
3121 return this->u2_
.posd
->addralign();
3126 // Set the required alignment, which must be either 0 or a power of 2.
3127 // For input sections that are sub-classes of Output_section_data, a
3128 // alignment of zero means asking the underlying object for alignment.
3130 set_addralign(uint64_t addralign
)
3136 gold_assert((addralign
& (addralign
- 1)) == 0);
3137 this->p2align_
= ffsll(static_cast<long long>(addralign
));
3141 // Return the current required size, without finalization.
3143 current_data_size() const;
3145 // Return the required size.
3149 // Whether this is an input section.
3151 is_input_section() const
3153 return (this->shndx_
!= OUTPUT_SECTION_CODE
3154 && this->shndx_
!= MERGE_DATA_SECTION_CODE
3155 && this->shndx_
!= MERGE_STRING_SECTION_CODE
3156 && this->shndx_
!= RELAXED_INPUT_SECTION_CODE
);
3159 // Return whether this is a merge section which matches the
3162 is_merge_section(bool is_string
, uint64_t entsize
,
3163 uint64_t addralign
) const
3165 return (this->shndx_
== (is_string
3166 ? MERGE_STRING_SECTION_CODE
3167 : MERGE_DATA_SECTION_CODE
)
3168 && this->u1_
.entsize
== entsize
3169 && this->addralign() == addralign
);
3172 // Return whether this is a merge section for some input section.
3174 is_merge_section() const
3176 return (this->shndx_
== MERGE_DATA_SECTION_CODE
3177 || this->shndx_
== MERGE_STRING_SECTION_CODE
);
3180 // Return whether this is a relaxed input section.
3182 is_relaxed_input_section() const
3183 { return this->shndx_
== RELAXED_INPUT_SECTION_CODE
; }
3185 // Return whether this is a generic Output_section_data.
3187 is_output_section_data() const
3189 return this->shndx_
== OUTPUT_SECTION_CODE
;
3192 // Return the object for an input section.
3196 // Return the input section index for an input section.
3200 // For non-input-sections, return the associated Output_section_data
3202 Output_section_data
*
3203 output_section_data() const
3205 gold_assert(!this->is_input_section());
3206 return this->u2_
.posd
;
3209 // For a merge section, return the Output_merge_base pointer.
3211 output_merge_base() const
3213 gold_assert(this->is_merge_section());
3214 return this->u2_
.pomb
;
3217 // Return the Output_relaxed_input_section object.
3218 Output_relaxed_input_section
*
3219 relaxed_input_section() const
3221 gold_assert(this->is_relaxed_input_section());
3222 return this->u2_
.poris
;
3225 // Set the output section.
3227 set_output_section(Output_section
* os
)
3229 gold_assert(!this->is_input_section());
3230 Output_section_data
* posd
=
3231 this->is_relaxed_input_section() ? this->u2_
.poris
: this->u2_
.posd
;
3232 posd
->set_output_section(os
);
3235 // Set the address and file offset. This is called during
3236 // Layout::finalize. SECTION_FILE_OFFSET is the file offset of
3237 // the enclosing section.
3239 set_address_and_file_offset(uint64_t address
, off_t file_offset
,
3240 off_t section_file_offset
);
3242 // Reset the address and file offset.
3244 reset_address_and_file_offset();
3246 // Finalize the data size.
3248 finalize_data_size();
3250 // Add an input section, for SHF_MERGE sections.
3252 add_input_section(Relobj
* object
, unsigned int shndx
)
3254 gold_assert(this->shndx_
== MERGE_DATA_SECTION_CODE
3255 || this->shndx_
== MERGE_STRING_SECTION_CODE
);
3256 return this->u2_
.posd
->add_input_section(object
, shndx
);
3259 // Given an input OBJECT, an input section index SHNDX within that
3260 // object, and an OFFSET relative to the start of that input
3261 // section, return whether or not the output offset is known. If
3262 // this function returns true, it sets *POUTPUT to the offset in
3263 // the output section, relative to the start of the input section
3264 // in the output section. *POUTPUT may be different from OFFSET
3265 // for a merged section.
3267 output_offset(const Relobj
* object
, unsigned int shndx
,
3268 section_offset_type offset
,
3269 section_offset_type
* poutput
) const;
3271 // Return whether this is the merge section for the input section
3274 is_merge_section_for(const Relobj
* object
, unsigned int shndx
) const;
3276 // Write out the data. This does nothing for an input section.
3278 write(Output_file
*);
3280 // Write the data to a buffer. This does nothing for an input
3283 write_to_buffer(unsigned char*);
3285 // Print to a map file.
3287 print_to_mapfile(Mapfile
*) const;
3289 // Print statistics about merge sections to stderr.
3291 print_merge_stats(const char* section_name
)
3293 if (this->shndx_
== MERGE_DATA_SECTION_CODE
3294 || this->shndx_
== MERGE_STRING_SECTION_CODE
)
3295 this->u2_
.posd
->print_merge_stats(section_name
);
3299 // Code values which appear in shndx_. If the value is not one of
3300 // these codes, it is the input section index in the object file.
3303 // An Output_section_data.
3304 OUTPUT_SECTION_CODE
= -1U,
3305 // An Output_section_data for an SHF_MERGE section with
3306 // SHF_STRINGS not set.
3307 MERGE_DATA_SECTION_CODE
= -2U,
3308 // An Output_section_data for an SHF_MERGE section with
3310 MERGE_STRING_SECTION_CODE
= -3U,
3311 // An Output_section_data for a relaxed input section.
3312 RELAXED_INPUT_SECTION_CODE
= -4U
3315 // For an ordinary input section, this is the section index in the
3316 // input file. For an Output_section_data, this is
3317 // OUTPUT_SECTION_CODE or MERGE_DATA_SECTION_CODE or
3318 // MERGE_STRING_SECTION_CODE.
3319 unsigned int shndx_
;
3320 // The required alignment, stored as a power of 2.
3321 unsigned int p2align_
;
3324 // For an ordinary input section, the section size.
3326 // For OUTPUT_SECTION_CODE or RELAXED_INPUT_SECTION_CODE, this is not
3327 // used. For MERGE_DATA_SECTION_CODE or MERGE_STRING_SECTION_CODE, the
3333 // For an ordinary input section, the object which holds the
3336 // For OUTPUT_SECTION_CODE or MERGE_DATA_SECTION_CODE or
3337 // MERGE_STRING_SECTION_CODE, the data.
3338 Output_section_data
* posd
;
3339 Output_merge_base
* pomb
;
3340 // For RELAXED_INPUT_SECTION_CODE, the data.
3341 Output_relaxed_input_section
* poris
;
3343 // The line number of the pattern it matches in the --section-ordering-file
3344 // file. It is 0 if does not match any pattern.
3345 unsigned int section_order_index_
;
3348 // Store the list of input sections for this Output_section into the
3349 // list passed in. This removes the input sections, leaving only
3350 // any Output_section_data elements. This returns the size of those
3351 // Output_section_data elements. ADDRESS is the address of this
3352 // output section. FILL is the fill value to use, in case there are
3353 // any spaces between the remaining Output_section_data elements.
3355 get_input_sections(uint64_t address
, const std::string
& fill
,
3356 std::list
<Input_section
>*);
3358 // Add a script input section. A script input section can either be
3359 // a plain input section or a sub-class of Output_section_data.
3361 add_script_input_section(const Input_section
& input_section
);
3363 // Set the current size of the output section.
3365 set_current_data_size(off_t size
)
3366 { this->set_current_data_size_for_child(size
); }
3368 // End of linker script support.
3370 // Save states before doing section layout.
3371 // This is used for relaxation.
3375 // Restore states prior to section layout.
3383 // Convert existing input sections to relaxed input sections.
3385 convert_input_sections_to_relaxed_sections(
3386 const std::vector
<Output_relaxed_input_section
*>& sections
);
3388 // Find a relaxed input section to an input section in OBJECT
3389 // with index SHNDX. Return NULL if none is found.
3390 const Output_relaxed_input_section
*
3391 find_relaxed_input_section(const Relobj
* object
, unsigned int shndx
) const;
3393 // Whether section offsets need adjustment due to relaxation.
3395 section_offsets_need_adjustment() const
3396 { return this->section_offsets_need_adjustment_
; }
3398 // Set section_offsets_need_adjustment to be true.
3400 set_section_offsets_need_adjustment()
3401 { this->section_offsets_need_adjustment_
= true; }
3403 // Adjust section offsets of input sections in this. This is
3404 // requires if relaxation caused some input sections to change sizes.
3406 adjust_section_offsets();
3408 // Whether this is a NOLOAD section.
3411 { return this->is_noload_
; }
3416 { this->is_noload_
= true; }
3418 // Print merge statistics to stderr.
3420 print_merge_stats();
3422 // Set a fixed layout for the section. Used for incremental update links.
3424 set_fixed_layout(uint64_t sh_addr
, off_t sh_offset
, off_t sh_size
,
3425 uint64_t sh_addralign
);
3427 // Return TRUE if the section has a fixed layout.
3429 has_fixed_layout() const
3430 { return this->has_fixed_layout_
; }
3432 // Reserve space within the fixed layout for the section. Used for
3433 // incremental update links.
3435 reserve(uint64_t sh_offset
, uint64_t sh_size
);
3438 // Return the output section--i.e., the object itself.
3443 const Output_section
*
3444 do_output_section() const
3447 // Return the section index in the output file.
3449 do_out_shndx() const
3451 gold_assert(this->out_shndx_
!= -1U);
3452 return this->out_shndx_
;
3455 // Set the output section index.
3457 do_set_out_shndx(unsigned int shndx
)
3459 gold_assert(this->out_shndx_
== -1U || this->out_shndx_
== shndx
);
3460 this->out_shndx_
= shndx
;
3463 // Update the data size of the Output_section. For a typical
3464 // Output_section, there is nothing to do, but if there are any
3465 // Output_section_data objects we need to do a trial layout
3470 // Set the final data size of the Output_section. For a typical
3471 // Output_section, there is nothing to do, but if there are any
3472 // Output_section_data objects we need to set their final addresses
3475 set_final_data_size();
3477 // Reset the address and file offset.
3479 do_reset_address_and_file_offset();
3481 // Return true if address and file offset already have reset values. In
3482 // other words, calling reset_address_and_file_offset will not change them.
3484 do_address_and_file_offset_have_reset_values() const;
3486 // Write the data to the file. For a typical Output_section, this
3487 // does nothing: the data is written out by calling Object::Relocate
3488 // on each input object. But if there are any Output_section_data
3489 // objects we do need to write them out here.
3491 do_write(Output_file
*);
3493 // Return the address alignment--function required by parent class.
3495 do_addralign() const
3496 { return this->addralign_
; }
3498 // Return whether there is a load address.
3500 do_has_load_address() const
3501 { return this->has_load_address_
; }
3503 // Return the load address.
3505 do_load_address() const
3507 gold_assert(this->has_load_address_
);
3508 return this->load_address_
;
3511 // Return whether this is an Output_section.
3513 do_is_section() const
3516 // Return whether this is a section of the specified type.
3518 do_is_section_type(elfcpp::Elf_Word type
) const
3519 { return this->type_
== type
; }
3521 // Return whether the specified section flag is set.
3523 do_is_section_flag_set(elfcpp::Elf_Xword flag
) const
3524 { return (this->flags_
& flag
) != 0; }
3526 // Set the TLS offset. Called only for SHT_TLS sections.
3528 do_set_tls_offset(uint64_t tls_base
);
3530 // Return the TLS offset, relative to the base of the TLS segment.
3531 // Valid only for SHT_TLS sections.
3533 do_tls_offset() const
3534 { return this->tls_offset_
; }
3536 // This may be implemented by a child class.
3538 do_finalize_name(Layout
*)
3541 // Print to the map file.
3543 do_print_to_mapfile(Mapfile
*) const;
3545 // Record that this section requires postprocessing after all
3546 // relocations have been applied. This is called by a child class.
3548 set_requires_postprocessing()
3550 this->requires_postprocessing_
= true;
3551 this->after_input_sections_
= true;
3554 // Write all the data of an Output_section into the postprocessing
3557 write_to_postprocessing_buffer();
3559 typedef std::vector
<Input_section
> Input_section_list
;
3561 // Allow a child class to access the input sections.
3562 const Input_section_list
&
3563 input_sections() const
3564 { return this->input_sections_
; }
3566 // Whether this always keeps an input section list
3568 always_keeps_input_sections() const
3569 { return this->always_keeps_input_sections_
; }
3571 // Always keep an input section list.
3573 set_always_keeps_input_sections()
3575 gold_assert(this->current_data_size_for_child() == 0);
3576 this->always_keeps_input_sections_
= true;
3580 // We only save enough information to undo the effects of section layout.
3581 class Checkpoint_output_section
3584 Checkpoint_output_section(uint64_t addralign
, elfcpp::Elf_Xword flags
,
3585 const Input_section_list
& input_sections
,
3586 off_t first_input_offset
,
3587 bool attached_input_sections_are_sorted
)
3588 : addralign_(addralign
), flags_(flags
),
3589 input_sections_(input_sections
),
3590 input_sections_size_(input_sections_
.size()),
3591 input_sections_copy_(), first_input_offset_(first_input_offset
),
3592 attached_input_sections_are_sorted_(attached_input_sections_are_sorted
)
3596 ~Checkpoint_output_section()
3599 // Return the address alignment.
3602 { return this->addralign_
; }
3604 // Return the section flags.
3607 { return this->flags_
; }
3609 // Return a reference to the input section list copy.
3612 { return &this->input_sections_copy_
; }
3614 // Return the size of input_sections at the time when checkpoint is
3617 input_sections_size() const
3618 { return this->input_sections_size_
; }
3620 // Whether input sections are copied.
3622 input_sections_saved() const
3623 { return this->input_sections_copy_
.size() == this->input_sections_size_
; }
3626 first_input_offset() const
3627 { return this->first_input_offset_
; }
3630 attached_input_sections_are_sorted() const
3631 { return this->attached_input_sections_are_sorted_
; }
3633 // Save input sections.
3635 save_input_sections()
3637 this->input_sections_copy_
.reserve(this->input_sections_size_
);
3638 this->input_sections_copy_
.clear();
3639 Input_section_list::const_iterator p
= this->input_sections_
.begin();
3640 gold_assert(this->input_sections_size_
>= this->input_sections_
.size());
3641 for(size_t i
= 0; i
< this->input_sections_size_
; i
++, ++p
)
3642 this->input_sections_copy_
.push_back(*p
);
3646 // The section alignment.
3647 uint64_t addralign_
;
3648 // The section flags.
3649 elfcpp::Elf_Xword flags_
;
3650 // Reference to the input sections to be checkpointed.
3651 const Input_section_list
& input_sections_
;
3652 // Size of the checkpointed portion of input_sections_;
3653 size_t input_sections_size_
;
3654 // Copy of input sections.
3655 Input_section_list input_sections_copy_
;
3656 // The offset of the first entry in input_sections_.
3657 off_t first_input_offset_
;
3658 // True if the input sections attached to this output section have
3659 // already been sorted.
3660 bool attached_input_sections_are_sorted_
;
3663 // This class is used to sort the input sections.
3664 class Input_section_sort_entry
;
3666 // This is the sort comparison function for ctors and dtors.
3667 struct Input_section_sort_compare
3670 operator()(const Input_section_sort_entry
&,
3671 const Input_section_sort_entry
&) const;
3674 // This is the sort comparison function for .init_array and .fini_array.
3675 struct Input_section_sort_init_fini_compare
3678 operator()(const Input_section_sort_entry
&,
3679 const Input_section_sort_entry
&) const;
3682 // This is the sort comparison function when a section order is specified
3683 // from an input file.
3684 struct Input_section_sort_section_order_index_compare
3687 operator()(const Input_section_sort_entry
&,
3688 const Input_section_sort_entry
&) const;
3691 // Fill data. This is used to fill in data between input sections.
3692 // It is also used for data statements (BYTE, WORD, etc.) in linker
3693 // scripts. When we have to keep track of the input sections, we
3694 // can use an Output_data_const, but we don't want to have to keep
3695 // track of input sections just to implement fills.
3699 Fill(off_t section_offset
, off_t length
)
3700 : section_offset_(section_offset
),
3701 length_(convert_to_section_size_type(length
))
3704 // Return section offset.
3706 section_offset() const
3707 { return this->section_offset_
; }
3709 // Return fill length.
3712 { return this->length_
; }
3715 // The offset within the output section.
3716 off_t section_offset_
;
3717 // The length of the space to fill.
3718 section_size_type length_
;
3721 typedef std::vector
<Fill
> Fill_list
;
3723 // Map used during relaxation of existing sections. This map
3724 // a section id an input section list index. We assume that
3725 // Input_section_list is a vector.
3726 typedef Unordered_map
<Section_id
, size_t, Section_id_hash
> Relaxation_map
;
3728 // Add a new output section by Input_section.
3730 add_output_section_data(Input_section
*);
3732 // Add an SHF_MERGE input section. Returns true if the section was
3733 // handled. If KEEPS_INPUT_SECTIONS is true, the output merge section
3734 // stores information about the merged input sections.
3736 add_merge_input_section(Relobj
* object
, unsigned int shndx
, uint64_t flags
,
3737 uint64_t entsize
, uint64_t addralign
,
3738 bool keeps_input_sections
);
3740 // Add an output SHF_MERGE section POSD to this output section.
3741 // IS_STRING indicates whether it is a SHF_STRINGS section, and
3742 // ENTSIZE is the entity size. This returns the entry added to
3745 add_output_merge_section(Output_section_data
* posd
, bool is_string
,
3748 // Sort the attached input sections.
3750 sort_attached_input_sections();
3752 // Find the merge section into which an input section with index SHNDX in
3753 // OBJECT has been added. Return NULL if none found.
3754 Output_section_data
*
3755 find_merge_section(const Relobj
* object
, unsigned int shndx
) const;
3757 // Build a relaxation map.
3759 build_relaxation_map(
3760 const Input_section_list
& input_sections
,
3762 Relaxation_map
* map
) const;
3764 // Convert input sections in an input section list into relaxed sections.
3766 convert_input_sections_in_list_to_relaxed_sections(
3767 const std::vector
<Output_relaxed_input_section
*>& relaxed_sections
,
3768 const Relaxation_map
& map
,
3769 Input_section_list
* input_sections
);
3771 // Build the lookup maps for merge and relaxed input sections.
3773 build_lookup_maps() const;
3775 // Most of these fields are only valid after layout.
3777 // The name of the section. This will point into a Stringpool.
3779 // The section address is in the parent class.
3780 // The section alignment.
3781 uint64_t addralign_
;
3782 // The section entry size.
3784 // The load address. This is only used when using a linker script
3785 // with a SECTIONS clause. The has_load_address_ field indicates
3786 // whether this field is valid.
3787 uint64_t load_address_
;
3788 // The file offset is in the parent class.
3789 // Set the section link field to the index of this section.
3790 const Output_data
* link_section_
;
3791 // If link_section_ is NULL, this is the link field.
3793 // Set the section info field to the index of this section.
3794 const Output_section
* info_section_
;
3795 // If info_section_ is NULL, set the info field to the symbol table
3796 // index of this symbol.
3797 const Symbol
* info_symndx_
;
3798 // If info_section_ and info_symndx_ are NULL, this is the section
3801 // The section type.
3802 const elfcpp::Elf_Word type_
;
3803 // The section flags.
3804 elfcpp::Elf_Xword flags_
;
3805 // The order of this section in the output segment.
3806 Output_section_order order_
;
3807 // The section index.
3808 unsigned int out_shndx_
;
3809 // If there is a STT_SECTION for this output section in the normal
3810 // symbol table, this is the symbol index. This starts out as zero.
3811 // It is initialized in Layout::finalize() to be the index, or -1U
3812 // if there isn't one.
3813 unsigned int symtab_index_
;
3814 // If there is a STT_SECTION for this output section in the dynamic
3815 // symbol table, this is the symbol index. This starts out as zero.
3816 // It is initialized in Layout::finalize() to be the index, or -1U
3817 // if there isn't one.
3818 unsigned int dynsym_index_
;
3819 // The input sections. This will be empty in cases where we don't
3820 // need to keep track of them.
3821 Input_section_list input_sections_
;
3822 // The offset of the first entry in input_sections_.
3823 off_t first_input_offset_
;
3824 // The fill data. This is separate from input_sections_ because we
3825 // often will need fill sections without needing to keep track of
3828 // If the section requires postprocessing, this buffer holds the
3829 // section contents during relocation.
3830 unsigned char* postprocessing_buffer_
;
3831 // Whether this output section needs a STT_SECTION symbol in the
3832 // normal symbol table. This will be true if there is a relocation
3834 bool needs_symtab_index_
: 1;
3835 // Whether this output section needs a STT_SECTION symbol in the
3836 // dynamic symbol table. This will be true if there is a dynamic
3837 // relocation which needs it.
3838 bool needs_dynsym_index_
: 1;
3839 // Whether the link field of this output section should point to the
3840 // normal symbol table.
3841 bool should_link_to_symtab_
: 1;
3842 // Whether the link field of this output section should point to the
3843 // dynamic symbol table.
3844 bool should_link_to_dynsym_
: 1;
3845 // Whether this section should be written after all the input
3846 // sections are complete.
3847 bool after_input_sections_
: 1;
3848 // Whether this section requires post processing after all
3849 // relocations have been applied.
3850 bool requires_postprocessing_
: 1;
3851 // Whether an input section was mapped to this output section
3852 // because of a SECTIONS clause in a linker script.
3853 bool found_in_sections_clause_
: 1;
3854 // Whether this section has an explicitly specified load address.
3855 bool has_load_address_
: 1;
3856 // True if the info_section_ field means the section index of the
3857 // section, false if it means the symbol index of the corresponding
3859 bool info_uses_section_index_
: 1;
3860 // True if input sections attached to this output section have to be
3861 // sorted according to a specified order.
3862 bool input_section_order_specified_
: 1;
3863 // True if the input sections attached to this output section may
3865 bool may_sort_attached_input_sections_
: 1;
3866 // True if the input sections attached to this output section must
3868 bool must_sort_attached_input_sections_
: 1;
3869 // True if the input sections attached to this output section have
3870 // already been sorted.
3871 bool attached_input_sections_are_sorted_
: 1;
3872 // True if this section holds relro data.
3874 // True if this is a small section.
3875 bool is_small_section_
: 1;
3876 // True if this is a large section.
3877 bool is_large_section_
: 1;
3878 // Whether code-fills are generated at write.
3879 bool generate_code_fills_at_write_
: 1;
3880 // Whether the entry size field should be zero.
3881 bool is_entsize_zero_
: 1;
3882 // Whether section offsets need adjustment due to relaxation.
3883 bool section_offsets_need_adjustment_
: 1;
3884 // Whether this is a NOLOAD section.
3885 bool is_noload_
: 1;
3886 // Whether this always keeps input section.
3887 bool always_keeps_input_sections_
: 1;
3888 // Whether this section has a fixed layout, for incremental update links.
3889 bool has_fixed_layout_
: 1;
3890 // For SHT_TLS sections, the offset of this section relative to the base
3891 // of the TLS segment.
3892 uint64_t tls_offset_
;
3893 // Saved checkpoint.
3894 Checkpoint_output_section
* checkpoint_
;
3895 // Fast lookup maps for merged and relaxed input sections.
3896 Output_section_lookup_maps
* lookup_maps_
;
3897 // List of available regions within the section, for incremental
3899 Free_list free_list_
;
3902 // An output segment. PT_LOAD segments are built from collections of
3903 // output sections. Other segments typically point within PT_LOAD
3904 // segments, and are built directly as needed.
3906 // NOTE: We want to use the copy constructor for this class. During
3907 // relaxation, we may try built the segments multiple times. We do
3908 // that by copying the original segment list before lay-out, doing
3909 // a trial lay-out and roll-back to the saved copied if we need to
3910 // to the lay-out again.
3912 class Output_segment
3915 // Create an output segment, specifying the type and flags.
3916 Output_segment(elfcpp::Elf_Word
, elfcpp::Elf_Word
);
3918 // Return the virtual address.
3921 { return this->vaddr_
; }
3923 // Return the physical address.
3926 { return this->paddr_
; }
3928 // Return the segment type.
3931 { return this->type_
; }
3933 // Return the segment flags.
3936 { return this->flags_
; }
3938 // Return the memory size.
3941 { return this->memsz_
; }
3943 // Return the file size.
3946 { return this->filesz_
; }
3948 // Return the file offset.
3951 { return this->offset_
; }
3953 // Whether this is a segment created to hold large data sections.
3955 is_large_data_segment() const
3956 { return this->is_large_data_segment_
; }
3958 // Record that this is a segment created to hold large data
3961 set_is_large_data_segment()
3962 { this->is_large_data_segment_
= true; }
3964 // Return the maximum alignment of the Output_data.
3966 maximum_alignment();
3968 // Add the Output_section OS to this PT_LOAD segment. SEG_FLAGS is
3969 // the segment flags to use.
3971 add_output_section_to_load(Layout
* layout
, Output_section
* os
,
3972 elfcpp::Elf_Word seg_flags
);
3974 // Add the Output_section OS to this non-PT_LOAD segment. SEG_FLAGS
3975 // is the segment flags to use.
3977 add_output_section_to_nonload(Output_section
* os
,
3978 elfcpp::Elf_Word seg_flags
);
3980 // Remove an Output_section from this segment. It is an error if it
3983 remove_output_section(Output_section
* os
);
3985 // Add an Output_data (which need not be an Output_section) to the
3986 // start of this segment.
3988 add_initial_output_data(Output_data
*);
3990 // Return true if this segment has any sections which hold actual
3991 // data, rather than being a BSS section.
3993 has_any_data_sections() const;
3995 // Whether this segment has a dynamic relocs.
3997 has_dynamic_reloc() const;
3999 // Return the address of the first section.
4001 first_section_load_address() const;
4003 // Return whether the addresses have been set already.
4005 are_addresses_set() const
4006 { return this->are_addresses_set_
; }
4008 // Set the addresses.
4010 set_addresses(uint64_t vaddr
, uint64_t paddr
)
4012 this->vaddr_
= vaddr
;
4013 this->paddr_
= paddr
;
4014 this->are_addresses_set_
= true;
4017 // Update the flags for the flags of an output section added to this
4020 update_flags_for_output_section(elfcpp::Elf_Xword flags
)
4022 // The ELF ABI specifies that a PT_TLS segment should always have
4023 // PF_R as the flags.
4024 if (this->type() != elfcpp::PT_TLS
)
4025 this->flags_
|= flags
;
4028 // Set the segment flags. This is only used if we have a PHDRS
4029 // clause which explicitly specifies the flags.
4031 set_flags(elfcpp::Elf_Word flags
)
4032 { this->flags_
= flags
; }
4034 // Set the address of the segment to ADDR and the offset to *POFF
4035 // and set the addresses and offsets of all contained output
4036 // sections accordingly. Set the section indexes of all contained
4037 // output sections starting with *PSHNDX. If RESET is true, first
4038 // reset the addresses of the contained sections. Return the
4039 // address of the immediately following segment. Update *POFF and
4040 // *PSHNDX. This should only be called for a PT_LOAD segment.
4042 set_section_addresses(Layout
*, bool reset
, uint64_t addr
,
4043 unsigned int* increase_relro
, bool* has_relro
,
4044 off_t
* poff
, unsigned int* pshndx
);
4046 // Set the minimum alignment of this segment. This may be adjusted
4047 // upward based on the section alignments.
4049 set_minimum_p_align(uint64_t align
)
4051 if (align
> this->min_p_align_
)
4052 this->min_p_align_
= align
;
4055 // Set the offset of this segment based on the section. This should
4056 // only be called for a non-PT_LOAD segment.
4058 set_offset(unsigned int increase
);
4060 // Set the TLS offsets of the sections contained in the PT_TLS segment.
4064 // Return the number of output sections.
4066 output_section_count() const;
4068 // Return the section attached to the list segment with the lowest
4069 // load address. This is used when handling a PHDRS clause in a
4072 section_with_lowest_load_address() const;
4074 // Write the segment header into *OPHDR.
4075 template<int size
, bool big_endian
>
4077 write_header(elfcpp::Phdr_write
<size
, big_endian
>*);
4079 // Write the section headers of associated sections into V.
4080 template<int size
, bool big_endian
>
4082 write_section_headers(const Layout
*, const Stringpool
*, unsigned char* v
,
4083 unsigned int* pshndx
) const;
4085 // Print the output sections in the map file.
4087 print_sections_to_mapfile(Mapfile
*) const;
4090 typedef std::vector
<Output_data
*> Output_data_list
;
4092 // Find the maximum alignment in an Output_data_list.
4094 maximum_alignment_list(const Output_data_list
*);
4096 // Return whether the first data section is a relro section.
4098 is_first_section_relro() const;
4100 // Set the section addresses in an Output_data_list.
4102 set_section_list_addresses(Layout
*, bool reset
, Output_data_list
*,
4103 uint64_t addr
, off_t
* poff
, unsigned int* pshndx
,
4106 // Return the number of Output_sections in an Output_data_list.
4108 output_section_count_list(const Output_data_list
*) const;
4110 // Return whether an Output_data_list has a dynamic reloc.
4112 has_dynamic_reloc_list(const Output_data_list
*) const;
4114 // Find the section with the lowest load address in an
4115 // Output_data_list.
4117 lowest_load_address_in_list(const Output_data_list
* pdl
,
4118 Output_section
** found
,
4119 uint64_t* found_lma
) const;
4121 // Find the first and last entries by address.
4123 find_first_and_last_list(const Output_data_list
* pdl
,
4124 const Output_data
** pfirst
,
4125 const Output_data
** plast
) const;
4127 // Write the section headers in the list into V.
4128 template<int size
, bool big_endian
>
4130 write_section_headers_list(const Layout
*, const Stringpool
*,
4131 const Output_data_list
*, unsigned char* v
,
4132 unsigned int* pshdx
) const;
4134 // Print a section list to the mapfile.
4136 print_section_list_to_mapfile(Mapfile
*, const Output_data_list
*) const;
4138 // NOTE: We want to use the copy constructor. Currently, shallow copy
4139 // works for us so we do not need to write our own copy constructor.
4141 // The list of output data attached to this segment.
4142 Output_data_list output_lists_
[ORDER_MAX
];
4143 // The segment virtual address.
4145 // The segment physical address.
4147 // The size of the segment in memory.
4149 // The maximum section alignment. The is_max_align_known_ field
4150 // indicates whether this has been finalized.
4151 uint64_t max_align_
;
4152 // The required minimum value for the p_align field. This is used
4153 // for PT_LOAD segments. Note that this does not mean that
4154 // addresses should be aligned to this value; it means the p_paddr
4155 // and p_vaddr fields must be congruent modulo this value. For
4156 // non-PT_LOAD segments, the dynamic linker works more efficiently
4157 // if the p_align field has the more conventional value, although it
4158 // can align as needed.
4159 uint64_t min_p_align_
;
4160 // The offset of the segment data within the file.
4162 // The size of the segment data in the file.
4164 // The segment type;
4165 elfcpp::Elf_Word type_
;
4166 // The segment flags.
4167 elfcpp::Elf_Word flags_
;
4168 // Whether we have finalized max_align_.
4169 bool is_max_align_known_
: 1;
4170 // Whether vaddr and paddr were set by a linker script.
4171 bool are_addresses_set_
: 1;
4172 // Whether this segment holds large data sections.
4173 bool is_large_data_segment_
: 1;
4176 // This class represents the output file.
4181 Output_file(const char* name
);
4183 // Indicate that this is a temporary file which should not be
4187 { this->is_temporary_
= true; }
4189 // Try to open an existing file. Returns false if the file doesn't
4190 // exist, has a size of 0 or can't be mmaped. This method is
4191 // thread-unsafe. If BASE_NAME is not NULL, use the contents of
4192 // that file as the base for incremental linking.
4194 open_base_file(const char* base_name
, bool writable
);
4196 // Open the output file. FILE_SIZE is the final size of the file.
4197 // If the file already exists, it is deleted/truncated. This method
4198 // is thread-unsafe.
4200 open(off_t file_size
);
4202 // Resize the output file. This method is thread-unsafe.
4204 resize(off_t file_size
);
4206 // Close the output file (flushing all buffered data) and make sure
4207 // there are no errors. This method is thread-unsafe.
4211 // Return the size of this file.
4214 { return this->file_size_
; }
4216 // Return the name of this file.
4219 { return this->name_
; }
4221 // We currently always use mmap which makes the view handling quite
4222 // simple. In the future we may support other approaches.
4224 // Write data to the output file.
4226 write(off_t offset
, const void* data
, size_t len
)
4227 { memcpy(this->base_
+ offset
, data
, len
); }
4229 // Get a buffer to use to write to the file, given the offset into
4230 // the file and the size.
4232 get_output_view(off_t start
, size_t size
)
4234 gold_assert(start
>= 0
4235 && start
+ static_cast<off_t
>(size
) <= this->file_size_
);
4236 return this->base_
+ start
;
4239 // VIEW must have been returned by get_output_view. Write the
4240 // buffer to the file, passing in the offset and the size.
4242 write_output_view(off_t
, size_t, unsigned char*)
4245 // Get a read/write buffer. This is used when we want to write part
4246 // of the file, read it in, and write it again.
4248 get_input_output_view(off_t start
, size_t size
)
4249 { return this->get_output_view(start
, size
); }
4251 // Write a read/write buffer back to the file.
4253 write_input_output_view(off_t
, size_t, unsigned char*)
4256 // Get a read buffer. This is used when we just want to read part
4257 // of the file back it in.
4258 const unsigned char*
4259 get_input_view(off_t start
, size_t size
)
4260 { return this->get_output_view(start
, size
); }
4262 // Release a read bfufer.
4264 free_input_view(off_t
, size_t, const unsigned char*)
4268 // Map the file into memory or, if that fails, allocate anonymous
4273 // Allocate anonymous memory for the file.
4277 // Map the file into memory.
4279 map_no_anonymous(bool);
4281 // Unmap the file from memory (and flush to disk buffers).
4291 // Base of file mapped into memory.
4292 unsigned char* base_
;
4293 // True iff base_ points to a memory buffer rather than an output file.
4294 bool map_is_anonymous_
;
4295 // True if base_ was allocated using new rather than mmap.
4296 bool map_is_allocated_
;
4297 // True if this is a temporary file which should not be output.
4301 } // End namespace gold.
4303 #endif // !defined(GOLD_OUTPUT_H)